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BIOLOGY 101 BIO Quiz 6
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BIOLOGY 101 BIO Quiz 6
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Question 1pts
The genetic disorder phenylketonuria (PKU) is caused by a recessive allele (n). The family tree below
shows the incidence of the disease over three generations.
q6-chart.jpg
What is the genotype of Jane's husband? (see Family Tree above)
Your Answer:
Jane's husband is genotype is Nn
Question 2
pts
The appearance of an organism is its
genotype.
phenotype.
genotype ratio.
phenotype ratio.
Question 3
pts
An individual heterozygous for a trait and an individual homozygous recessive for the trait are crossed
and produce many offspring that are
all the same genotype.
of two different phenotypes
of three different phenotypes.
all the same phenotype.
,Question 4
pts
A segment of DNA that controls a particular hereditary trait is called a(n) ___.
genotype
heredity
allele
trait
gene
Question 5
pts
What is the name for a chart of a family that traces gene expression through several generations?
Pedigree
Question 6
pts
Explain why the ABO blood types are an example of codominance? Be sure to briefly define
codominance in your answer.
Your Answer:
"When alleles show a co-dominant relationship, neither allele is dominant and both are expressed in the
phenotype of the heterozygote. The human ABO blood groups provide a good example of codominance.
The ABO system is due to a gene that codes for molecules on the surface of red blood cells. In this
system, there is an A allele, a B allele, and an O allele. The A and B alleles are codominant to each other,
and the O allele is recessive. The notation for the A allele is IA, for the B allele is IB,and for the O allele is
i. If a person has type A blood, he or she may be homozygous for the A allele (IAIA) or heterozygous for A
and O alleles (IAi). "
Penn State Eberly College of Science. Biology 011. Codominance. Web. 27 November 2016.
, https://online.science.psu.edu/biol011_sandbox_7239/node/7358
Question 7
pts
Some people have AB blood types for the ABO blood system. They have all of the characteristics of both
type A and type B blood--they are not a blend of them. The inheritance pattern responsible for this is
referred to as:
codominance
dominance
blending
Question 8
pts
In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
In an Ss genotype, which allele is expressed in the phenotype?
Your Answer:
In an genotype Ss Short fur is expressed
Question 9
pts
The genetic disorder phenylketonuria (PKU) is caused by a recessive allele (n). The family tree below
shows the incidence of the disease over three generations.
q6-chart.jpg
What is the genotype of Jane's husband? (see Family Tree above)
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