The Pleiotropy That Occurs When a Single Gene Controls Multiple

question 41

Multiple Choice

The pleiotropy that occurs when a single gene controls multiple skeletal traits in dogs,such as leg bone length and skull size,may be explained because

• A) dogs share a common ancestor.
• B) the skeletal traits are related in the overall function of the dog.
• C) dogs have lived with humans for thousands of years.
• D) the effect of this gene depends on the environment.

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Definitions:

Ovarian Follicle

is a fluid-filled sac in the ovary that contains a developing egg (oocyte), destined to release an egg during ovulation.

Primordial Follicle

The earliest form of an ovarian follicle, consisting of an immature egg surrounded by a single layer of cells, present from birth in females.

Vesicular Follicle

A fluid-filled structure in the ovary that contains a maturing egg and releases it during ovulation.

Extraembryonic Membrane

Membranes outside the embryo, such as the amnion, chorion, yolk sac, and allantois, that support the development of the embryo.