Differences in sexual attraction between males and females based on behavior, physiology, or morphology is an example of a _____ isolation mechanism
A. prezygotic
B. postzygotic
A
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Which of the following is not true of human immunodeficiency virus (HIV)?
A. It is the causative agent of acquired immune deficiency syndrome (AIDS). B. It targets the B cells of the immune system. C. It binds to the cell surface receptor CD4. D. It kills many of the cells it infects but can integrate into the host genome. E. It has the most error-prone of all reverse transcriptases, which results in a high mutation rate.
The distinctive fur pattern of Siamese cats results when genes that are responsible for the coat color are influenced by
A) age. B) X-inactivation. C) gender. D) temperature. E) other genes.
__ stimulates the descent of the testes
Fill in the blank(s) with the appropriate word(s).
Ultraviolet light can cause the potentially deadly skin disease
A) Skin cancer B) Carbon footprint C) Age structure D) Emigration E) Desertification F) Chlorofluorocarbon G) Ozone H) Carrying capacity I) Density-dependent J) Death rate