Biology 251 - Genetics » Spring 2021 » Topic 4.2 Quiz
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Question #1
Dosage compensation for the X chromosome in mammals is obtained through condensation of one X chromosme into a _______.
A.
gametic body.
B.
inactivated body.
C.
nuclear body.
D.
Barr body.
E.
Lyon body.
Question #2
In cats, coat color with a calico phenotype is only seen in individuals that are:
A.
homozygous females.
B.
hemizygous males.
C.
heterozygous males.
D.
heterozygous females.
E.
homozygous males.
Question #3
Nondisjunction that results in gametes with an extra chromosome can lead to generation of a(n) __________ zygote.
A.
diploid
B.
haplodiploid
C.
euploid
D.
aneuploid
E.
triploid
Question #4
A human with 45 chromosomes due to presence of only a single X chromosome would present the phenotype of:
A.
a female with Turner's syndrome.
B.
a normal female.
C.
a PolyX female.
D.
a normal male.
E.
a male with Klinefelter's syndrome.
Question #5
In a mammalian karyotype with a sex chromosome complement of XXXY, _________ chromosome(s) would be randomly inactivated in each cell for dosage compensation.
A.
4
B.
1
C.
0
D.
3
E.
2
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