When Comparing the Sequences of a Homologous Gene in Four

question 33

Multiple Choice

When comparing the sequences of a homologous gene in four different species,one pair of species shows a 1% difference,whereas the other pair shows a 3% difference.Which pair diverged longer ago from their common ancestor and why?

• A)The pair with a 1% difference;a smaller difference (1% instead of 3%)indicates that there has been less time to accumulate mutations.
• B)The pair with a 1% difference;a smaller difference (1% instead of 3%)indicates that there has been more time to accumulate mutations.
• C)The pair with a 3% difference;A larger difference (3% instead of 1%)indicates that there has been less time to accumulate mutations.
• D)The pair with a 3% difference;A larger difference (3% instead of 1%)indicates that there has been more time to accumulate mutations.

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Definitions:

Hypokinetic

Describes conditions or disorders characterized by reduced movement or activity.

Direct Pathway

The Direct Pathway is a neural pathway within the basal ganglia that facilitates movement initiation by positively modulating motor output signals in the brain.

Basal Ganglia

A group of structures in the brain that are involved in coordinating movement, as well as aspects of learning and emotion.

Globus Pallidus

A subcortical structure in the brain involved in the regulation of voluntary movement, part of the basal ganglia.