Behavioral Genetics Methods Can Test the Evolutionary Hypothesis That Girls

question 40

Multiple Choice

Behavioral genetics methods can test the evolutionary hypothesis that girls growing up without an investing father shift to earlier onset of menarche and sexual behavior. Which of the following behavioral genetics findings would refute this hypothesis?

• A) Identical twin sisters raised together enter menarche at the same age, but identical twin sisters raised apart show less similar onset ages for menarche.
• B) The environmental component of menarche onset is larger than the genetic component.
• C) The genetic component of menarche onset is larger than the environmental component.
• D) Age of onset of menarche is not correlated between girls and their biological mothers.

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Definitions:

Amniotic Sac

A sac that holds the embryo (and later fetus). Also called the bag of water.

Chorion

The embryo’s outermost membrane.

Blastocyst

A collection of about 100 human cells that develops from the zygote.

Gastrulation

An early embryonic phase during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.