Studies on aneuploidies of the sex chromosomes reveal that
A. the X chromosome is not necessary for survival.
B. the Y chromosome is not necessary for survival.
C. two copies of the X chromosome are necessary for survival.
D. two copies of the Y chromosome are fatal.
E. none of these is true.
B
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Most of these problems are accepted by the vast majority of reputable scientists as being
anthropogenic, or human-caused. Select the exception.
a. global warming b. decline in Atlantic cod size at maturity c. desertification of the Everglades d. background extinction rate e. deformities among whooping cranes
Which of the following choices is a proximate cause of the non-combative behavior of male African
cichlids that do not hold territories?
a. Cichlids can detect and store information about aggressive encounters. b. The GnRH-producing neurons in the hypothalamus are small. c. The testes produce no testosterone. d. GnRH production is high. e. Noncombative behavior allows the male to build his strength for a takeover attempt on a territory.
Why does cigarette smoke cause a smoker's skin to wrinkle over time?
A) The fibroblast cells that secrete proteins to the skin are degraded. B) The collagen and elastin matrix that holds skin to muscle is broken down. C) The ground substance in skin is converted to protein fibers. D) The nervous tissue that makes skin tighten is destroyed.
Imagine that smurfs live in widely separated groups and rarely interbreed, so geneticists know very little about them. On one occasion, two smurfs from different groups did mate. A big-footed, white smurf mated with a small-footed, blue smurf
Three offspring resulted: one big-footed and blue and two small-footed and blue. Which statement about the inheritance of color in smurfs is most likely to be correct? A) Blue is dominant to white. B) White and blue are codominant. C) White is dominant to blue.