Download Chapter 11 Quiz

Chapter 11 Quiz
1. What is the ratio of phenotypes in the offspring produced when a flower with a genotype of Pp selffertilizes? Assume complete dominance for the trait.
a.
b.
c.
d.
e.
100% dominant
100% recessive
75% dominant: 25% recessive
50% dominant: 50% recessive
25% dominant: 75% recessive
2. If the allele for inflated pea pods (I) is dominant to the allele for constricted (i), the cross Ii x ii is expected to
produce
a.
b.
c.
d.
e.
all with inflated pods.
all with constricted pods.
half with inflated and half with constricted pods.
3/4 with inflated and 1/4 with constricted pods.
3/4 with constricted and 1/4 with inflated pods.
3. A series of crosses produced 915 offspring with normal pigment and 310 with albinism. What are the
genotypes of the parents?
a.
b.
c.
d.
e.
One of the parents was homozygous for albinism.
Both parents were heterozygous.
One parent was homozygous for normal pigmentation.
Both parents were albinos.
605 albino zygotes must have failed to develop.
4. Imagine that your friend Roger has cystic fibrosis but his parents do not. If cystic fibrosis is a recessive trait,
what do you know about Roger's alleles, and those of his parents, at the cystic fibrosis locus of their DNA?
a. This information is insufficient to allow me to conclude anything about the cystic fibrosis alleles in the DNA
of Roger's parents.
b. This information is insufficient to allow me to conclude anything about the cystic fibrosis alleles in Roger’s
DNA.
c. Roger is heterozygous and his parents are homozygous at the cystic fibrosis locus.
d. Roger is homozygous and his parents are heterozygous at the cystic fibrosis locus.
5. Anne Boleyn, King Henry VIII's second wife, was beheaded because she did not provide him with a son as
an heir. Explain why King Henry should have blamed himself and not his wife.
a. All of the sperm that males produce contain an X chromosome, so their genetic contribution to the child
determines its sex.
b. All of the eggs that females produce contain an X chromosome, so their genetic contribution to the child
does not determine its sex.
c. The eggs that females produce contain either an X or a Y chromosome, so their genetic contribution to the
child is unrelated to its sex.
6. A couple brings home their new, non-identical twin daughters, Joan and Jill. After several months, the father
begins to suspect that there was a mix-up at the hospital, because Jill doesn’t look much like either parent or
like her sister. When the twins' blood tests come back, the father calls his lawyer to start a lawsuit against the
hospital. The mother, father, and Joan have type A blood, but Jill has type O blood. Does the father have a case?
a.
b.
c.
d.
No, because parents with type A blood can have a child with type O blood.
No, because parents with any blood type (A, B, AB, or O) can produce children with type O blood.
Yes, because all of this couple’s children will have type A blood.
Yes, because people with type A blood can pass on only A alleles to their children.
7. In humans, red-green colorblindness is sex-linked and recessive (e). A man with normal color vision marries
a colorblind woman who gives birth to a colorblind daughter. From this we can tell that
a.
b.
c.
d.
e.
The woman is Ee.
The daughter is Ee.
The man probably is not the father of the child.
Colorblindness is not a genetic trait.
None of these choices is correct.
8. Which of the following is caused by an abnormal number of autosomes?
a.
b.
c.
d.
Down syndrome
Klinefelter syndrome
Turner syndrome
Marfan syndrome
9. What is the root cause of sickle-cell anemia?
a.
b.
c.
d.
mutations in the gene that directs the synthesis of the hemoglobin protein
an amino acid substitution in the hemoglobin protein
malaria
abnormally shaped red blood cells
10. According to the Law of Segregation, in an organism with the genotype Aa,
a.
b.
c.
d.
e.
all the gametes will have gene A.
all the gametes will have gene a.
half the gametes will have A and half will have a.
3/4 of the gametes will have A and 1/4 will have a.
1/4 of the gametes will have A and 3/4 will have a.