Transcript Goal 3.03 Quiz 1

What information can be revealed by a Punnett
square?
A. gender of parents
B. pattern of inheritance in families
C. potential genotypes and phenotypes of
offspring
D. potential chromosomal abnormalities in
offspring
Sarah has attached earlobes (recessive allele, b). Her
father has free earlobes (dominant allele, B), while her
mother has attached earlobes. Which are most likely the
genotypes of the family?
A. Sarah = Bb
Mother = BB
Father = Bb
B. Sarah = bb
Mother = Bb
Father = BB
C. Sarah = Bb
Mother = Bb
Father = Bb
D. Sarah = bb
Mother = bb
Father = Bb
If all the offspring of a test cross display a
dominant phenotype, which can be determined
about the individual?
A. The individual’s genotype will be tt.
B. The individual’s genotype will be Ttt.
C. The individual’s genotype will be TT.
D. The individual’s genotype will be TtTt.
Which term best describes an individual who is
heterozygous for a recessive trait?
A. a carrier
B. a genome
C. an allele
D. an autosome
Two parents both have brown eyes. They have two
children, one with brown eyes and one with green
eyes. Which explains how this could have occurred?
A. Eye color is a homozygous trait controlled by two
or more alleles.
B. Eye color is a polygenic trait controlled by two or
more genes.
C. Brown and green eye color are both dominant
genes.
D. Green eye color is the result of a mutation.
Which is the best example of a polygenic trait?
A. blood type
B. face freckles
C. hair color
D. free or attached earlobes
What is the purpose of a test cross?
A. to determine if a trait is polygenic
B. to determine the sex of an organism
C. to determine the genotype of an organism
D. to determine the phenotype of an organism
A shorthorn cow has a red and white mixed coat
called roan. There are red hairs, white hairs, and
red/white hairs in the coat. What is the
genotype for co-dominant roan color?
A. RR
B. RW
C. WW
D. rw
Red-green color vision is controlled by an allele
located on the X-chromosome. A woman with
normal color vision, but whose father is red-green
colorblind, marries a man who is red-green
colorblind. If a son is born to this couple, what is
the probability that he will inherit red-green color
blindness?
A. 0%
B. 25 %
C. 50 %
D. 100%
What is the genotype of the parent generation
mother in the diagram?
A. homozygous dominant
B. homozygous recessive
C. co-dominant
D. heterozygous
If an offspring has a 50% chance of inheriting
the recessive trait (aa), which represents the
genotypes of its parents?
A. Aa and Aa
B. Aa and aa
C. aa and aa
D. AA and AA
How many phenotypes and genotypes are
possible from the three alleles (A, B, and O) in
human blood?
A. 6 phenotypes, 4 genotypes
B. 3 phenotypes, 2 genotypes
C. 4 phenotypes, 6 genotypes
D. 2 phenotypes, 4 genotypes
Duchenne Muscular Dystrophy is a recessive sexlinked condition that is more common in males than
in females. Which statement best explains why this
is true?
A. Males inherit the recessive allele from their
fathers.
B. Males inherit the recessive allele on the Xchromosome only.
C. Males inherit the recessive allele on the Ychromosome only.
D. Males must have two recessive alleles to inherit
the condition.
Two chromosomes code for two different
genetic traits. How does meiosis explain the
variety of genotypes in potential offspring?
A. During meiosis, both chromosomes pass on
two alleles to each of two diploid cells.
B. During meiosis, both chromosomes pass on
one allele to each of two diploid cells.
C. During meiosis, both chromosomes pass on
two alleles to each of four haploid cells.
D. During meiosis, both chromosomes pass on
one allele to each of four haploid cells.
One of the parents of a child has
phenylketonuria (PKU), which is caused by
recessive alleles. The other parent does not have
the PKU alleles. What is the chance that the
couple will have a child with phenylketonuria?
A. 0%
B. 50%
C. 75%
D. 100%