White eyes in Drosophila is a mutation that turned

out to be an X-linked recessive. Would you expect
that the first time the white eye was discovered it
was in a male or female? What will be an ideal response?


Answer: male

Biology & Microbiology

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The onset of AIDS is often accompanied by  

A.  a steep drop in T cell numbers. B.  macrophage infection. C.  a positive HIV test. D.  lung infections and other opportunistic infections. E.  Kaposi's sarcoma.

Biology & Microbiology

One major innovation in animal body plan was the development of the coelom. Describe the role of the coelom

What will be an ideal response?

Biology & Microbiology

What are the two main types of mycorrhizae, and how do they differ? List three ways in which mycorrhizal

associations are beneficial to plants. What will be an ideal response?

Biology & Microbiology

Which of the following characteristics distinguish Darwin's theory from earlier explanations of biological diversity and adaptive traits?

a. Darwin provided purely spiritual, rather than physical, explanations for the origins of biological diversity. b. Darwin recognized that evolutionary change occurs in groups of organisms rather than in individuals: some members of a group survive and reproduce more successfully than others. c. Darwin described evolution as a single-stage process: variations arise within groups, natural selection eliminates unsuccessful variations, and the next generation inherits successful variations. d. Like Lamarck, Darwin understood that evolution does not occur because some organisms function worse than others in a particular environment.

Biology & Microbiology