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Keith_Richards [23]
4 years ago
8

There are multiple lines of evidence that provide support for common ancestry and evolution. Write 3-4 paragraphs describing at

least three of them in detail. Provide at least one example for each line of evidence.
Biology
1 answer:
Pavlova-9 [17]4 years ago
4 0

1) Homologous features:

These are the features or structures that have similar structure in several different organisms but function in a unique way in all of them. These structures indicate anatomical similarities as well as same ancestry of different organisms. For example, the forelimb of birds, humans, dogs and whales, perform different function in all these organisms. But when we analyse the layout of bones or layout of arrangement, we find that it is very similar across all of them. This indicates that, the ancestor of all these organisms was was, but with the passage of time when organism dispersed, and environmental conditions changed, it was evolved into different organisms as per favorable conditions.


2) Molecular biology:

As we know that all living organisms are a compilation of billions and trillions of unique biological molecules, that group in unique fashion to constitute whole organism. Interestingly, some biological molecules and the process of their formation can provide sound evidences of evolution. For example, DNA,  sequence of nucleotide in DNA, amino acids, process of transcription, translation etc.


The study of evolution through molecular uniformity has led to the foundation of a novel branch of evolution called phylogenetics. The sequence of nucleotides in DNA is used to find the best possible ancestor of any organism. For example, Phylogenetic analysis has found that the origin of eukaryotes is from prokaryotes over the period of time.


3) Fossil records:

Fossils are the preserved remains of previously living organisms or their traces, dating from the distant past. This don't means that fossils represent complete skeleton of an organism, because many organisms don't even fossilize and those who fossilize don't have complete remains.Nonetheless, the fossils that humans have collected offer unique insights into evolution over long timescales. For example, study of horse fossils has enabled the scientists to reconstruct a large, branching "family tree" for horses and their now-extinct relatives.

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Effectus [21]
<h2>Law of independent assortment </h2>

Explanation:

  • There are 8 distinct phenotypes, each one has a 12,5% of appearance: Since M=solid leaves D=normal height P= smooth skin.
  • Recessive gene characters can only be taken in homozygous recessive mmddpp.  

      1. MmDdPp: M=solid leaves D=normal height P= smooth skin.

     2. MmDdpp M=solid leaves D=normal height pp= peach skin.

    3. MmddPp M=solid leaves dd=dwarf height P= smooth skin.  

    4. Mmddpp M=solid leaves dd=dwarf height pp= peach skin.

    5. mmDdPp mm=mottled leaves D=normal height P= smooth skin.  

    6. mmDdpp mm=mottled leaves D=normal height pp= peach skin.  

    7. mmddPp mm=mottled leaves dd=dwarf height P= smooth skin.  

   8. mmddpp mm=mottled leaves dd=dwarf height pp= peach skin.

Hence,The answer is all eight possible phenotypes from the cross MmDdPp x mmddpp are equally likely, resulting in a phenotypic ratio of 1:1:1:1:1:1:1:1

3 0
4 years ago
Describe the general composition of a protein molecule.
dexar [7]

Answer:

Protein is made up of 20 different amino acids. Each amino acid consists of a central carbon. This central carbon is bonded to an amine group (NH2), a carboxyl group (COOH), a hydrogen atom and an R group.

Amino acids can be linked together when the amine group of one amino acid is bonded to the carboxyl group of a different amino acid. The COOH donates an OH group and the NH2 donates a H. The OH and H come together to form a water molecule, so this process is called dehydration synthesis - water is removed to form something new. The bond which holds the amino acids together is called a polypeptide.

Explanation:

8 0
4 years ago
Which of the following best describes ribosomes?
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Tiny structures which mark proteins from dna
4 0
2 years ago
Read 2 more answers
Investigate substances containing carbon or oxygen that relate to biological processes. Explain their main function in those pro
Scorpion4ik [409]

Answer:

Well, you already have the answer, but I can try to elaborate XD

So, DNA: contains genetic information that is necessary for biological functioning and reproduction.

More specifically, it contains the genetic instructions through gene encoding that instructs the cell what to do. A specialized complex ribosome interacts with the DNA molecules and "reads" it, changing the genes from the DNA into proteins that the cell as a whole can function upon. It is also crucial to forming a whole cell in offspring, since only the genes from the two parents combined (in humans at least) can produce an offspring with all genes intact. Those who do not have genetic disorders, a famous one being Down Syndrome.

Next, RNA: a molecule necessary for expressing genes and making proteins.

Connecting to the paragraph above for DNA, RNA also assists in the process by reading the ribosome that reads the DNA itself. Complicated, I know. All you have to know, however, is that the RNA, in this case called mRNA since it serves as a messenger, hence, the "m", reads the codons produced by the ribosome when it reads the DNA, and makes proteins according to those codons, and those proteins then scatter all across the cell to execute instructions.

Now, we move onto nitrogen and phosphorous: both are found in amino acids, the building blocks of proteins.

That is actually partially wrong. Amino acids do not contain phosphorous, but do contain nitrogen. Not exactly sure what went wrong on your end there, but nitrogen is a basic building block for amino acids, which are basic building blocks themselves for proteins. To be more clear, amino acids are made of carbon, hydrogen, oxygen and nitrogen atoms. No phosphorus there!

Finally, enzymes: special proteins that accelerate chemical reactions in cells.

This is correct. Enzymes typically lower the activation energy required for reactions to happen. More specifically, enzymes make the reaction molecules more active, hence, lowering the threshold for the amount of energy you have to put in before the molecules start crashing into each other hard enough to have a chemical reaction. Of course, enzymes do not participate in the reaction itself, which makes them incredibly useful for spurring on chemical reactions since they can be used multiple times.

Yes i know the answer is long

ididnt know how big or small you wanted it

so......yea

hope it helps

7 0
3 years ago
(problem 5a) what are the substrates for rna synthesis?
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<span>The four ribonucleoside triphos phates: adenosine triphosphate (ATP), guanosine triphosphate (GTP), cytidine triphosphate (CTP), and uridine triphosphate (UTP).</span>
3 0
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