Early in development, female mammalian embryos convert an X chromosome in each cell into an inactivated form. What is this form called?
a. neutral X
b. odontoid process
c. Barr body
d. axial body
c. Barr body
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Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
The fact that genes associated with altruism are favored by natural selection if they lead to the reproductive success of an altruist's closest relatives is called _____.
A. inclusive fitness B. survival of the fittest C. evolution D. inbreeding E. selective mating
A diarrhea called "rice-water" stools is diagnostic of (campylobacteriosis/cholera/shigellosis/typhoid)
What will be an ideal response?
Water fleas, Daphnia magna, can switch between asexual and sexual reproduction cy-cles. Which of the following observations support(s) the hypothesis that sex is favored in unpredictable environments?
a. The introduction of predators triggers sexual reproduction. b. Daphnia reproduces asexually every other generation in a variety of habi-tats. c. Daphnia reproduces sexually when its aquatic habitat dries up. d. Asexual D. magna strains outcompete introduced competitors. e. A and C.