Answer:
Natural Selection in Real Time
"When we made the comparison between the size of the offspring generation and the population before selection, we found a measured, evolutionary response had taken place and it was almost identical to what we had predicted."
-Peter Grant
Darwin thought that evolution took place over hundreds or thousands of years and was impossible to witness in a human lifetime. Peter and Rosemary Grant have seen evolution happen over the course of just two years.
The Grants study the evolution of Darwin's finches on the Galapagos Islands. The birds have been named for Darwin, in part, because he later theorized that the 13 distinct species were all descendants of a common ancestor. Each species eats a different type of food and has unique characteristics developed through evolution. For example, the cactus finch has a long beak that reaches into blossoms, the ground finch has a short beak adapted for eating seeds buried under the soil, and the tree finch has a parrot-shaped beak suited for stripping bark to find insects.
The Grants have focused their research on the medium ground finch, Geospiza fortis, on the small island of Daphne Major. Daphne Major serves as an ideal site for research because the finches have few predators or competitors. (The only other finch on the island is the cactus finch.) The major factor influencing survival of the medium ground finch is the weather, and thus the availability of food. The medium ground finch has a stubby beak and eats mostly seeds. Medium ground finches are variable in size and shape, which makes them a good subject for a study of evolution.
The first event that the Grants saw affect the food supply was a drought that occurred in 1977. For 551 days the islands received no rain. Plants withered and finches grew hungry. The tiny seeds the medium ground finches were accustomed to eating grew scarce. Medium ground finches with larger beaks could take advantage of alternate food sources because they could crack open larger seeds. The smaller-beaked birds couldn't do this, so they died of starvation.
In 1978 the Grants returned to Daphne Major to document the effect of the drought on the next generation of medium ground finches. They measured the offspring and compared their beak size to that of the previous (pre-drought) generations. They found the offsprings' beaks to be 3 to 4% larger than their grandparents'. The Grants had documented natural selection in action.
While beak size is clearly related to feeding strategies, it is also related to reproduction. Female finches tend to mate with males that have the same size beaks. These factors together can add to the development of new species.
The Grants return each year to Daphne Major to observe and measure finches. They have been collecting data on the finches for over 25 years and have witnessed natural selection operating in different ways under different circumstances.
What are some advantages of asexual reproduction when compared to sexual reproduction? What are some disadvantages of asexual production when compared to sexual reproduction
Answer:
produces genetic variation in the offspring.
the species can adapt to new environments due to variation, which gives them a survival advantage.
a disease is less likely to affect all the individuals in a population.
What can the people of the Earth do to change this issue?
Answer:
Whereas a change in a person may take 10-50 years to manifest itself, changes in the earth can take millions of years to become apparent. Also, humans may experience changes in their personalities as well as in their bodies, while changes in the earth are never psychological.
I’ll mark as BRANLIEST!!
30 POINTS!!
Please help me!!
How does DNA change from generation to generation in asexual organisms?
1. Cloning
2.Mutation
3.Variation
4. Gene pairing
please help (repost)
ACTUAL ANSWERS and braincells are required
5 How does the presence of coal on Antarctica indicate a climate change?
The discovery of a new coal deposit means people will be able to use this found fuel longer.
Coal forms from the remains of plants that lived in tropical swamps millions of years ago, Coal deposits can tell scientists what the composition of the atmosphere was in the past.
Coal is burned for fuel and it releases carbon dioxide into the atmosphere.
Answer:
The discovery of a new coal deposit means people will be able to use this fossil fuel longer.
Coal is burned for a fuel and releases carbon dioxide into the atmosphere.
When S strain bacteria were killed by being heated to 60C, then mixed with live strain bacteria and injected into mice, a greater % of
mice died than when the strain bacteria were heated to 100C. Can you propose an explanation for these observations?
Answer:
Due to live strain bacteria.
Explanation:
The first method cause more damage to the mice as compared to the second method because in the first method the killed bacteria were mixed with the live strain bacteria. This live strain bacteria causes diseases in the mice and eventually killed the mice while on the other hand, all the bacteria were killed due to very high temperature so that's why first method causes more damage than second one.
what is a mutagen? pls
Answer:
the answer is B
Explanation:
BIO, HELP!
you know the drill, if you’re right you get the brailiest
3.
Put the cells below in the correct order for Mitosis to occur.
A-B-D-C
B-A-D-C
C-D-A-B
D-A-B-C
Answer: last answer option
Explanation:
D - prophase - you can see this by the movement of centrosomes
A - metaphase - lining of chromosomes on metaphase plate
B - anaphase - splitting of sister chromatids
C - cytokinesis - formation of 2 new cells
the correct order is D A B C
Which amino acid is best represented by "CCA"? *
Answer:
Proline
Codon-Amino Acid Abbreviations
Explanation:
help is very much appreciated <3 (7th grade science)
Answer:
1. N/A
2. a cell
3. organ system
4.Tissues are groups of similar cells that have a common function. While an organ is a structure that is composed of at least two or more tissue types and performs a specific set of functions for the body.
5.
nervous system - The nervous helps the whole body communicate, our body needs to communicate so we can actually do things like breathing.
respiratory system - The respiratory system gives cells the oxygen they need to survive, and cells keep humans alive. Humans cannot survive without breathing.
digestive system - The digestive system is important for breaking down foods into nutrients, those nutrients are then used to heal and nourish the human body. The digestive system also helps us pass toxic wastes that build up in our bodies, so we don't get sick.
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hope this helps :)
What occurs in the brain (with regard to our muscles) as we train and even as we sleep?
Breaking the Code
REPLICATION:
For each of the three DNA sequences below, write the sequence of the complementary strand of DNA that results after
replication.
DNA molecule #1:
TACCGGATGCCAGATCAAATC
Complimentary DNA #1:
DNA molecule #2:
TACGGGGGCGTAACCACAACT
Complementary DNA #2:
DNA molecule #3:
TACCTGTTAAGCTACAAAATT
Complementary DNA #3:
Answer:
Complimentary DNA #1:
ATGGCCTACGGTCTAGTTTAG
Complementary DNA #2:
ATGCCCCCGCATTGGTGTTGA
Complementary DNA #3:
ATGGACAATTCGATGTTTTAA
DNA molecule 1: TACCGGATGCCAGATCAAATC, complimentary will be ATGGCCTACGGTCTAGTTTAG, for DNA molecule 2: TACGGGGGCGTAACCACAACT, complimentary will be ATGCCCCCGCATTGGTGTTGA.
What is complimentary DNA?Humans and nearly all other species carry their genetic information in DNA, also known as deoxyribonucleic acid. The DNA of an individual can be found in almost all of their cells.
The information molecule is DNA. It contains information needed to create proteins, which are other big molecules.
These instructions are dispersed throughout 46 lengthy structures called chromosomes that are found inside each of your cells. Numerous smaller pieces of DNA, known as genes, make up these chromosomes.
Complementary sequence is a sequence of bases in a nucleic acid that can be combined to generate a double-stranded structure.
For instance, G-T-A-C is the complementary sequence to C-A-T-G, where each letter represents for a different DNA nucleotide.
The DNA sequence can be:
DNA molecule 1: TACCGGATGCCAGATCAAATC, complimentary will be ATGGCCTACGGTCTAGTTTAG.DNA molecule 2: TACGGGGGCGTAACCACAACT, complimentary will be ATGCCCCCGCATTGGTGTTGA.DNA molecule 3: TACCTGTTAAGCTACAAAATT, complimentary will be ATGGACAATTCGATGTTTTAA.Thus, this is the complete match for the given scenario.
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While walking through a rainforest, a zoologist spots a colorful organism growing on a dead tree stump. Further examination reveals this organism is a
multicellular organism, possesses a nucleus, and has cell walls but no chloroplasts. The zoologist would most likely place this organism into which kingdom?
O A Plantae
OB. Decomposers
C. Prokaryotes
OD. Fungi
Answer:
D:fungi
Explanation:
The zoologist would most likely place this organism into Fungi kingdom. The correct option is D.
What is kingdom Fungi?Any member of the eukaryotic group of organisms, which also includes the more well-known mushrooms and microbes like yeast and mould, is referred to as a fungus.
Eukaryotic creatures known as fungi include yeasts, moulds, and mushrooms as well as other microbes.
These organisms fall under the category of fungus. The creatures that make up the Kingdom Fungi are pervasive and have a cell wall.
As a biologist notices a vibrant organism sprouting on a stump from a dead tree.
A closer look reveals that this organism is multicellular, contains a nucleus, cell walls, but no chloroplasts. He probably would have put this organism in the kingdom of fungi.
As prokaryotes and decomposers are not having the characters given by the zoologist and plant also possesses chloroplast, so it can come under Fungi Kingdom.
Thus, the correct option is D.
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Explain why the genes make the cell growth controller. The protein synthesis indicator and the DNA repair protein are active in all the cells.
Answer:
man im not sure
Explanation:
Produces what a plant needs to use to stay alive
When a new viral infection appears in a population,scientists usually try to develop a vaccine against the virus. Which substances would most likely be contained in the new vaccin
Answer:
Antigen, stabilizers, surfactants, diluents, preservatives
Explanation:
Antigen: This is part of the protein structure virus or part of its genetic material. These parts are active. But sometimes, the inactivated form of the virus is also included in the vaccine. Stabilizers: Avoid other chemical reactions occurring in the interior of the vaccine. Surfactants: They prevent the occurrence of sedimentation and agglutination of the elements inside the vaccine. Diluent: Used to dilute the vaccine in an appropriate concentration before being used. Preservatives: As the word says, preservatives avoid any possible contamination of the vaccine. These elements´ use depends on the doses prepared. If it is only for one-person use, then they are not needed. But if the doses are to be used by more than one person, they need preservatives because once the vaccine is opened it is vulnerable to contamination.How many valence electrons does phosphorus have?
A.6
B.4
C.5
D.3
Answer:
C: 5
Explanation:
i got it right on test.
Answer:
C.5
Explanation:
There are 5 in the Valence Shell.
DNA has four nitrogenous bases:
• ________________ that pairs with _________________ (Apple Tree)
• _________________ that pairs with _________________ (Car Garage)
Answer:
Adenine pairs with thymine
Cytosine pairs with guanine
Explanation:
The four nitrogenous bases: Adenine, Thymine, Cytosine and Guanine
Remember Apple Tree
Apple Tree = Adenine Thymine
and remember car garage
Car Garage = Cytosine Guanine
Answer:
Adenine pairs with thymine
Cytosine pairs with guanine
Explanation:
Hope this helps
A simple machine makes work
a. less, easier
b. easier, less
not
C. more, harder
d. harder, less
Answer:
easier
Explanation:
Answer: A simple machine makes work easier or less harder.
Why do hooked seeds spread better than seeds without hooks
Answer:
Explanation:
Seed has been designed with all sorts of hooks, barbs and sticky gels to provide a good hold on free transportation. ... The seeds' small silky hairs provide feathery parachutes, so a good wind or a good blow can send out for quite some distance.
Answer:
they can get farther and can reach down farther to get the best soil
Explanation:
Which best defines cloud computing?
оооо
Using a cloud to display the weather
Services, applications, or storage accessed via the Internet
A business propagated using the Internet
A portion of the Internet
.
PLSS HELPPPPPP
Were invertebrates more common? Did most organisms live on land or in the sea?
Answer:
Yes, invertebrates are common than vertebrates. Most organisms started off in the sea, then adapted to live on land.
Explanation:
In the past, the first animals were mostly invertebrates and lived in the water for a certain amount of time. Then, they developed the right body parts to be able to live on the land.
Answer:
invertebrates are animals with no backbone.
Glucocorticoids are steroid hormones that control cellular responses through several different signaling pathways. One of the signaling pathways involves the glucocorticoid receptor, an intracellular protein that is activated by binding to a glucocorticoid molecule. A simplified model of the glucocorticoid receptor signaling pathway is represented in Figure 1.
Which of the following statements best predicts the effect of a mutation that results in a loss of the glucocorticoid receptor’s ligand binding function?
Answer:
The answers are A and B.....
Which option would be a good course of action in the followingscenario?
An agronomist discovers that the plants in a field are all infected with a fungus.
A. immediately apply a fungicide
B. do nothing
C. test the fungus to determine if it is beneficial to the plants
D. burn the crop before the infection spreads to other fields
Answer:
C. test the fungus to determine if it is beneficial to the plants
Explanation:
Some fungi are good so it's good to check and see what effect it has on the plants.
Answer: test the fungus
Explanation:
just did it edge 2021
Why didn't Bill Stacy have blue skin even though his mother did?
Answer:
because bill stacy was sick.
Explanation:
Bill Stacy does not have blue skin even though his mother did because of variations that occur during the segregation of alleles after fertilization.
What do you mean by Variations?Variations may be defined as the altered appearance among individuals in the same population. It is one of the factors that are responsible for maintaining diversity.
Due to variations, offspring do not identical to their parents. These variations have resulted from either erotic reproduction or mutation.
Therefore, Bill Stacy does not have blue skin even though his mother did because of variations that occur during the segregation of alleles after fertilization.
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How do the laws of genetics (discovered by Mendel) govern what variations can and cannot be
possible in the offspring of any 2 sexually reproducing organisms? (List and define each of the 3 laws as
you answer this questions
Which of the following is most effective in helping rain forest plants trap
sunlight so that light energy can be converted to chemical energy? *
Large leaf size
Small seed size
Small Stem
Large root size
Answer:
The picture was NOT a part of that question. The correct answer is Large leaf size. A
Explanation:
Leafs trap sunlight to perform photosynthesis for chemical energy which takes place in the chloroplast.
Photosynthesis is the process by which plants convert light energy into chemical energy. Plants can trap more sunlight if the size of leaves is large. Thus, the correct option is A.
What is Photosynthesis?Photosynthesis is the process by which plants synthesize their food in the form of carbohydrates (sugars). This process takes place in the chloroplast of cell. It contains chlorophyll pigment. This pigment is responsible for trapping sunlight.
There are more chloroplast present on the leaf surface than other parts of cell. This organelle is responsible for the synthesis of carbohydrates in plants as they trap sunlight which is converted into chemical energy. The more the number of chloroplast in the cell, more will be the rate of photosynthesis in plants.
Therefore, the correct option is A.
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The diagram below shows a single animal cell with many of the cells organelles. Which structure contains the instructions for making a copy of the cell?
Answer:
The nucleus (On the image, it's the sphere in the middle)
It is the nucleus, which contains the instructions for making a copy of the cell.
What is a nucleus and its functions?It is a double-membrane-bound cell organelle found only in the eukaryotes, which comprises the genetic material. The prime function of the nucleus is to monitor a cell's reproduction and growth. It does not only store DNA, it also performs various essential cellular procedures.
The duplication of the DNA, that is, DNA replication takes place within the nucleus of the cell. It comprises the instructions for producing two identical copies of the cell, and each cell produced will get its own set of instructions. It is also the site for the process of transcription.
Thus, the nucleus is the structure that comprises the instructions for producing a copy of the cell.
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Which two factors are most likely to cause a plants guard cells to open its stomata.
Please help, I was seeing different responses to this question:)
Answer: The answer is in the picture
Explanation:
espero que esto ayude <3
Hope this helps <3
A student drew the following diagram to model the structure of a prairie
community. Which level represents short and tall grasses?
A. Level 2
B. Level 1
C. Level 4
D. Level 3
Answer: B. Level 1
Explanation:
The prairie community is dominated by the grass and vegetation cover. Thus the lower most trophic level in the prairie ecosystem are the short and tall grasses. They produce major source of biomass for the herbivores of the food chain. They consume the grasses can be designated as primary consumers of the food chain. Also the producers which are grasses which make up the large amount of biomass will provide a source of food for the consumers. They will receive 100 percent energy from the sun and they will utilize 90 percent of it to make their food by the process of photosynthesis. Only ten percent of energy is transferred to the next trophic level.
Answer:
B level 1
Explanation:
After an mRNA molecule is constructed from a DNA template, which statement explain what happens next? You should select all
that apply.
A)
The mRNA becomes a double stranded molecule.
B)
The mRNA brings an amino acid to the nucleus.
C)
The mRNA contains a start codon that reads AUG.
D)
The mRNA travels from the nucleus to the ribosome.
E)
The mRNA is exported from the cell through the membrane.
Answer:
C) The mRNA contains a start codon that reads AUG.
D) The mRNA travels from the nucleus to the ribosome.
Explanation:
mRNA is single stranded. The mRNA does leave the nucleus but does not leave the cell. The mRNA does not carry the amino acids, that job belongs to the tRNA and it brings them to the ribosome.
The formation of the mRNA from the DNA is called transcription. In this process, the mRNA has both the introns and the exons.
The correct option of the following question is D
The replication, transcription all process is occurs in the cytoplasm of the cell. After the process of replication, the DNA moves to the nucleus for the transcription process. The process of the formation of protein from the mRNA is called translation. The translation process occurs in the ribosomes.
The protein formation requires the ribosomes hence the RNA must be transferred to the ribosomes.
Hence, the correct option is D that is the mRNA travels from the nucleus to the ribosome.
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