Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil.
b. A peacock puts on a different mating display than a sparrow.
c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction.
d. A zebroid, a cross between a horse and zebra, is sterile.
e. One type of roundworm would reject the sperm from another species of roundworm.
ANSWER: d
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In the mating of an Aa female and an Aa male, the genotypic outcome predicted by a Punnett square is ________
A) three-quarters Aa and one-quarter AA B) one-half AA and one-half aa C) three-quarters Aa and one-quarter aa D) one-quarter AA, one-quarter aa, and one-half Aa E) All offspring will have the genotype Aa
In a dihybrid cross, you want to calculate the probability that an F2 progeny of the cross will inherit both dominant phenotypes. Which of the rules of probability can be used to calculate the probability of obtaining that combination of alleles?
What will be an ideal response?
Refer to the accompanying figure. Which statement is FALSE?
a. The of the air in the alveoli must be greater than 100 mm Hg. b. The in the tissues must be less than 100 mm Hg. c. The of the air in the alveoli must be less than 40 mm Hg. d. The in the tissues must be greater than 40 mm Hg. e. The in the tissues must be equal to the in the tissues.
Which of the following statements about the prokaryotic flagella is CORRECT?
a. it's filament is made up of multiple types of proteins b. it is driven by the proton motive force c. it is made up of a single structure d. it moves with a whiplike motion