Which of the following does not initiate DNA synthesis?
a. a double-stranded DNA virus (Poxviridae)
b. a DNA virus with reverse transcriptase (Hepadnaviridae)
c. an RNA virus with reverse transcriptase (Retroviridae)
d. a single-stranded RNA virus (Togaviridae)
e. none of the above
Answer: d. a single-stranded RNA virus (Togaviridae)
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In humans and other mammals, inactivated X chromosomes:
A. exhibit no gene transcription. B. exhibit a low level of transcription of a few genes. C. exhibit a low level of transcription of many genes. D. exhibit a normal level of transcription of a few genes. E. exhibit a normal level of transcription of many genes.
There is a color pattern inherited in certain mice in which agouti (gray) is homozygous, and yellow is
heterozygous. A cross of two yellows produces two yellows for each agouti. A second gene, C/c, controls the expression of the color genes: C is the dominant allele that allows color to be expressed, and the recessive gene in the homozygous condition (cc) prevents any color from being expressed. (a) Give the genotypes of a white parent crossed with a yellow parent that produces 1/2 white, 1/3 yellow, 1/6 agouti offspring. (b) Give the results of the cross of two forms heterozygous for each gene. (c) Can you develop a pure-breed population for any of the colors? What will be an ideal response?
In many damselfly species, males use specialized appendages to remove from the fe-male reproductive organ sperm from previous copulations with other males. How do you think this behavior most likely evolved?
a. via intersexual selection good genes model b. via intersexual postcopulatory selection c. via intrasexual sexual selection via cuckoldry d. via intrasexual postcopulatory selection e. C and D.
What number is/are naked icosahedral virus(es)?
What will be an ideal response?