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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

When the DNA sequences of two protein-coding genes are similar, but only for part of the protein-coding sequence, it suggests that:

a. the two proteins have one or more domains in common.

b. the two proteins were produced by duplication of an ancestral gene.

c. the two proteins perform the same function.

d. one of the two genes is actually a pseudogene.

e. both genes are pseudogenes.

Summary Introduction

Introduction:

Genes are a fundamental unit of life, made up of DNA (Deoxyribonucleic acid) sequences and contains coding and noncoding sequences. The coding sequences codes for a specific protein and these proteins perform distinct functions in a cell.

Explanation

Justification/ Explanation for the correct answer:

Option (a) says that the two proteins have one or more domains in common. Domains form the complex part of a protein. They are an independent tertiary structure that folds to perform different functions. Domains contain only protein-coding regions, with the same type of nucleotide sequences. If two different proteins contain two or more common domains, both the protein share similar genes containing protein-coding nucleotide sequences, which code for the same type of protein. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) states that the two proteins were produced by duplication of an ancestral gene. Two genes that are produced by gene duplication forms paralogs genes, which arise from a common ancestor. Since, both the gene contain similar nucleotide sequences and will have similar protein-coding sequences throughout...

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