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.
Barr body.
B.
inactivated body.
C.
Lyon body.
D.
nuclear body.
E.
gametic body.
Question #2
In cats, coat color with a calico phenotype is only seen in individuals that are:
A.
homozygous females.
B.
heterozygous females.
C.
homozygous males.
D.
hemizygous males.
E.
heterozygous 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.
triploid
D.
euploid
E.
aneuploid
Question #4
A human with 45 chromosomes due to presence of only a single X chromosome would present the phenotype of:
A.
a normal female.
B.
a normal male.
C.
a female with Turner's syndrome.
D.
a PolyX female.
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.
3
B.
2
C.
0
D.
4
E.
1
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