Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
23rd pair of chromosomes that differ in males and females are called _____. a. | autosomes | c. | multiple
alleles | b. | sex chromosomes | d. | polygenes | | | | |
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2.
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When
roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon
examination, it can be seen that the coat of a roan cow consists of both red and white hairs. This
trait is one controlled by _____. a. | polygenic inheritance | c. | multiple alleles | b. | codominant
alleles | d. | sex-linked
genes | | | | |
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3.
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What
type of inheritance pattern does the trait represented by the shaded symbols in Figure 14-1
illustrate? a. | incomplete
dominance | c. | codominance | b. | multiple alleles | d. | sex-linked | | | | |
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4.
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For
the trait being followed in the pedigree, individuals II-1 and II-4 in Figure 14-1 can be classified
as _____. a. | carriers | c. | homozygous
dominant | b. | mutants | d. | homozygous recessive | | | | |
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5.
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What
is the relationship between individual I-1 and individual III-2 in Figure 14-1? a. | grandmother-grandson | c. | great aunt-nephew | b. | mother-son | d. | grandfather-granddaughter | | | | |
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6.
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Because the gene for red-green color blindness is located on the X chromosome, it is
normally not possible for a _____. a. | color blind father to pass the gene on to his
daughter | b. | color blind father to pass the gene on to his
son | c. | carrier mother
to pass the gene on to her son | d. | carrier mother to pass the gene on to her
daughter | | |
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7.
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Which
of the bar graphs shown below represents what the phenotypic frequencies might be for polygenic
inheritance?
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8.
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In
pea plants, inflated pods (R) are dominant to constricted pods (r). Which of the
following crosses is a testcross? a. | Rr x Rr | c. | RR x RR | b. | RR x
Rr | d. | RR x
rr | | | | |
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9.
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If a
female fruit fly heterozygous for red eyes (XRXr) crossed with a white-eyed
male (XrY), what percent of their offspring would have white eyes?
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10.
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A
cross between a white rooster and a black hen results in 100% blue Andalusian offspring. When two of
these blue offspring are mated, the probable phenotypic ratio seen in their offspring would be
_____. a. | 75% black, 25%
white | c. | 25% black, 50%
blue, 25% white | b. | 75% blue, 25% white | d. | 100% blue | | | | |
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