If the Mutation Rate of Individual Genes Is Taken to Be

question 13

Multiple Choice

If the mutation rate of individual genes is taken to be about one in 100,000 genes per cell cycle across many organisms,we might expect evolution to proceed at a consistent rate for various forms of life.Which factor could make the accumulation of gene mutations faster or slower among different organisms?

• A)Organisms with more genes will likely have more mutations per generation.
• B)More selection of mutations can occur in a shorter period of time for bacteria that replicate each twenty minutes than for humans with a (roughly)20-year generation span.
• C)Organisms vary in the percent of loci that have multiple alleles.
• D)Some organisms may be more effective at repairing mutations before they are passed on to the next generation.
• E)All of the choices are correct.

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Definitions:

Limbic System

A complex system of nerves and networks in the brain, involving several areas near the edge of the cortex concerned with instinct and mood. It controls the basic emotions (fear, pleasure, anger) and drives (hunger, sex, dominance, care of offspring).

Emotional Brain

Refers to parts of the brain, such as the limbic system, that govern emotional responses.

Reticular Activating System

A network of neurons located in the brainstem that plays a crucial role in controlling arousal and consciousness.

Gateway To Memory

A metaphorical or literal reference to the neural mechanisms or processes that allow for the encoding, storage, and retrieval of memories.