Scientists Use Genetics to Trace the Evolution and Migration of Humans.How

question 14

Multiple Choice

Scientists use genetics to trace the evolution and migration of humans.How do scientists know which populations are older than others?

• A) Members of older populations have identical mitochondrial genomes.
• B) Members of older populations have more genes in their mitochondrial genomes.
• C) Members of older populations have more genetic variability.
• D) Members of older populations have fewer nuclear genes.
• E) Members of older populations have more nuclear genes.

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Definitions:

Fetus

A prenatal human between the embryonic state and birth.

Ectoderm

The outermost layer of cells in the early embryo, giving rise to structures such as the skin, nails, and hair, as well as the nervous system.

Inner Cell Mass

A group of cells inside the early embryo that will eventually develop into the body of the organism.

Digestive System

The complex series of organs and glands responsible for the breakdown, digestion, and absorption of nutrients from food into the body.