Genetic variability in meiosis results from ____
a. recombination of homologous chromosomes only
b. independent assortment of chromosomes only
c. random joining of male and female gametes only
d. recombination between sister chromatids and homologous chromosomes
e. recombination of homologous chromosomes, independent assortment of chromosomes, and random joining of
male and female gametes
ANSWER: e
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A marine biologist makes a presentation about crustaceans to your biology class. He explains that he has recently received an NSF grant to study sessile crustaceans. You are only aware of one group of sessile crustaceans. This crustacean must be
A. a lobster. B. a crayfish. C. a shrimp. D. a barnacle. E. the nauplius.
In one experiment, mice were genetically engineered to overexpress a particular set of miRNAs. These animals developed lymphomas. The genes encoding these miRNAs were acting as _________.
a) tumor suppressors b) sex-linked dominant alleles c) holandric genes d) oncogenes
Glycolysis is a metabolic process that is done by all cells. However, not all cells make use of another metabolic process called the Krebs cycle. What does this tell you about the evolution of these processes?
A. Both the Krebs cycle and glycolysis likely evolved at the same time B. As a metabolic process, the Krebs cycle likely evolved prior to glycolysis C. As a metabolic process, glycolysis likely evolved prior to the Krebs cycle
Herring gulls feed their chicks by regurgitating food for the chick in the nest. When a chick pecks at the red spot on the gull's beak, the parent regurgitates the food. Interestingly, the chicks will peck at any red spot, whether it is attached to a gull or not. Which features of this behavior are correctly labeled? (Check three.)
A. Key stimulus -- the red spot B. Innate releasing mechanism -- the red spot C. Key stimulus -- the shape of the parent's beak D. Key stimulus -- the regurgitated food E. Fixed action pattern -- pecking at the spot F. Fixed action pattern -- finding a healthy variety of food for the chick G. Innate releasing mechanism -- neural circuit that induces pecking in response to a red spot