The fact that calico cats are only female supports the theory of

A) two X chromosomes being required for coat color in cats.
B) mutations in all genes on one X chromosome.
C) testosterone inactivation of Y-chromosome genes.
D) X-chromosome inactivation and Barr bodies in females.


D

Biology & Microbiology

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Much of our understanding of how large organisms respond to environmental variation is based on

using model species.

Indicate whether the statement is true or false.

Biology & Microbiology

Veins

a. are under great pressure. b. are thicker than arteries. c. carry blood toward the heart. d. carry blood away from the heart.

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Historically, fishermen kept larger adult fish and left smaller adult fish. Over time, the average size of the fish would

A. increase by genetic drift. B. decrease by genetic drift. C. remain unchanged. D. decrease by natural selection. E. increase by natural selection.

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Hot flashes, insomnia and mood swings are characteristic of ____

a. menarche b. menopause c. gametogenesis d. menstruation e. ovulation

Biology & Microbiology