Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 1, Problem 11TYU
Summary Introduction

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The statements given in the question. Please refer the statement given in the question. that “If the theory of evolution is true..

Introduction:

The theory of evolution states that a gradual change is occurring continuously within the heritable traits over the passing time. To validate this theory, scientists started to trace back the origin of plants and animals on earth and how different the modern world is from the old world. They also started to compare genomes of different species to know that up to what extent one species differ from another on a molecular level and which species are closely related and which are distant.

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Imagine that you have the DNA sequences from the intron of a gene in three species called A, B, and C. Species A and B are most closely related, while C is more distantly related. The sequences of A and B differ by 18 base pairs, A and C differ by 26 base pairs, and B and C differ by 28 base pairs. Fossils show that species A and B diverged about 1.2 Mya, but there is no fossil evidence as to when the most recent common ancestor of all three species lived. (Draw a simple tree to help you think about the problem) Use the genetic data to estimate that date (most recent common ancestor). HINT = use Eqn 7.1, several times- first to estimate mutation rate. Then to estimate the unknown time since divergence
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