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A hypothetical phylogenetic tree is shown in Figure Q4-2. Use this tree to answer the following...

Question

A hypothetical phylogenetic tree is shown in Figure Q4-2. Use this tree to answer the following...

A hypothetical phylogenetic tree is shown in Figure Q4-2. Use this tree to answer the following question.

1. How many years ago did species M and N diverge from their last common ancestor? Are M and N more or less closely related to each other than P and S? In looking for functionally important nucleotide sequences, is it more informative to compare the genome sequences of M and N or those of M and Q? Explain.

last common ancestor million years before present % nucleotide substitution 0 м N O P R S Figure Q4-2

last common ancestor million years before present % nucleotide substitution 0 м N O P R S Figure Q4-2

Answers

Answer:

From the graph,

Species M and N separated from their last common ancestor about 8.5 million years ago.

my before present % nucleotide substitution M N O p q r se

Functionally important nucleotide sequences are critical for survival and are retained during evolution. This means, such sequences would be present in the same form even in those species which separated from their common ancestor long ago.

Species M and Q diverged from their common ancestor about 20 million years ago (mya), whereas species M and N separated 8.5 mya . Thus, M and Q separated long ago than M and N.

Hence, in looking for functionally important nucleotide sequences, is it more informative to compare the genome sequences of M and Q.


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