The success of camouflage from predatory birds drives the predominant phenotypes in snail color. This is an example
of ____.
a. predation as an agent of natural selection
b. sexual selection
c. predation as an agent of artificial selection
d. the founder effect
e. a selectively neutral phenotype
ANSWER: a
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Gametangia are
(a) chlorophyll-producing structures. (b) sex organs. (c) a name for colony-forming algae. (d) found in slime molds.
The following coat colors are known to be determined by alleles at one locus in horses:
palomino = golden coat with lighter mane and tail cremello = almost white chestnut = brown The following table gives ratios obtained in matings of the above varieties: Cross Parents Offspring 1 cremello x cremello all cremello 2 chestnut x chestnut all chestnut 3 cremello x chestnut all palomino 4 palomino x palomino 1/4 = chestnut 1/2 = palomino 1/4 cremello Assign gene symbols for the genetic control of coat color on the basis of these data. A) C1C1 = cremello, C2C2 = chestnut, C1C2 = palomino B) C1C1 = chestnut, C2C2 = palomino, C1C2 = cremello C) C1C1 = palomino, C2C2 = chestnut, C1C2 = cremello D) C1C1 = palomino, C2C2 = cremello, C1C2 = chestnut E) C1C1 = chestnut, C2C2 = cremello, C1C2 = palomino
The products of meiosis are:
A) two diploid cells. B) two haploid cells. C) four haploid cells. D) four diploid cells.
After considerable effort, you are able to collect and analyze DNA from the winged animal. You obtain the nucleotide sequence of the cytochrome c oxidase gene. When you compare this sequence to the sequence of the same gene in a bat, a rodent, a shrew,
and a human, you find the following numbers of differences: winged animal-bat 11 differences winged animal-rodent 14 differences winged animal-shrew 15 differences winged animal-human 9 differences Which hypothesis does this data support? A) Of the mammals tested, the winged animal is probably most closely related to humans. B) Of the mammals tested, the winged animal is probably most closely related to shrews. C) The winged animal is probably most closely related to bats, because bats also have wings. D) Of the mammals tested, the winged animal is probably most closely related to rodents.