Biology 251 - Genetics » Spring 2021 » Topic 5.1 Quiz
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Question #1
Inheritance from a cross of parents that are both heterozygous for a genotype that shows two phenotypes in their offspring in a ratio of 2:1 is indicative of ________.
A.
a homozygous lethal allele.
B.
incomplete penetrance.
C.
incomplete dominance.
D.
codominance.
Question #2
In contrast to complete dominance, in the F2 generation of a monohybrid cross, genes with alleles for incomplete dominance and codominance share:
A.
production of progeny with a 1:2:1 phenotype ratio.
B.
production of progeny with a 1:2:1 genotype ratio.
C.
production of progeny with a 3:1 genotype ratio.
D.
production of progeny with a 3:1 phenotype ratio.
Question #3
A genotype that has a range of phenotypes appearing in a population due to variations in gene expression is demonstrating the phenomenon of:
A.
incomplete dominance.
B.
expressivity.
C.
recessive lethal.
D.
codominance.
E.
incomplete penetrance.
Question #4
A genotype that shows the phenotype in only a proportion of individuals in a population is demonstrating the phenomenon of:
A.
incomplete penetrance.
B.
codominance.
C.
recessive lethal.
D.
incomplete dominance.
E.
expressivity.
Question #5
A heterozygote carrying the two alleles for blood types A and B demonstrates the phenomenon of:
A.
incomplete dominance.
B.
codominance.
C.
incomplete penetrance.
D.
hemizogosity.
E.
expressivity.
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