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Chapter Inheritance

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
In his experiments with plants, Mendel removed which part of the plant to prevent unwanted fertilizations?
a.
flowers
b.
petals
c.
pistils
d.
stamens
e.
stigmas
 

 2. 
A locus is
a.
a recessive gene.
b.
an unmatched allele.
c.
a sex chromosome.
d.
the location of an allele on a chromosome.
e.
a dominant gene.
 

 3. 
Diploid organisms
a.
have corresponding alleles on homologous chromosomes.
b.
are usually the result of the fusion of two haploid gametes.
c.
have two sets of chromosomes.
d.
have pairs of homologous chromosomes.
e.
all of these
 

 4. 
Gene A occurs on chromosome #5, gene B occurs on chromosome #21. Therefore, these two portions of the chromosomes CANNOT be
a.
genes.
b.
dominant.
c.
loci.
d.
alleles.
e.
recessive.
 

 5. 
If R is dominant to r, the offspring of the cross of RR with rr will
a.
be homozygous.
b.
display the same phenotype as the RR parent.
c.
display the same phenotype as the rr parent.
d.
have the same genotype as the RR parent.
e.
have the same genotype as the rr parent.
 

 6. 
In a Punnett square, the letters within the little boxes represent
a.
offspring genotypes.
b.
parental genotypes.
c.
gametes.
d.
offspring phenotypes.
e.
parental phenotypes.
 

 7. 
The theory of segregation
a.
deals with the alleles governing two different traits.
b.
applies only to linked genes.
c.
applies only to sex-linked genes.
d.
explains the behavior of a pair of alleles during meiosis.
e.
none of these
 

 8. 
The F2 phenotypic ratio of a monohybrid cross is
a.
1:1.
b.
2:1.
c.
9:3:3:1.
d.
1:2:1.
e.
3:1.
 

 9. 
A testcross involves
a.
two F1 hybrids.
b.
an F1 hybrid and an F2 offspring.
c.
two parental organisms.
d.
an F1 hybrid and the homozygous dominant parent.
e.
an F1 hybrid and an organism that is homozygous recessive for that trait.
 

 10. 
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If Bb Ss were crossed with Bb ss, the chance that a black solid individual would be produced is
a.
3/16.
b.
1/3.
c.
9/16.
d.
3/8.
e.
1/16.
 

 11. 
Susan, a mother with type B blood, has a child with type O blood. She claims that Craig, who has type A blood, is the father. He claims that he cannot possibly be the father. Further blood tests ordered by the judge reveal that Craig is AA. The judge rules that
a.
Susan is right and Craig must pay child support.
b.
Craig is right and doesn't have to pay child support.
c.
Susan cannot be the real mother of the child; there must have been an error made at the hospital.
d.
it is impossible to reach a decision based on the limited data available.
e.
none of these
 

 12. 
Blood types (A, B, and O) are controlled by
a.
sex-linked genes.
b.
linked genes.
c.
incompletely dominant genes.
d.
multiple alleles.
e.
none of these
 

 13. 
Pleiotropic genes
a.
act on secondary sexual characteristics.
b.
influence more than one aspect of phenotype.
c.
are additive.
d.
produce lethal effects when homozygous.
e.
none of these
 

 14. 
A bell-shaped curve of phenotypic variation is indicative of
a.
incomplete dominance.
b.
continuous variation.
c.
multiple alleles.
d.
epistasis.
e.
environmental variables on phenotypes.
 

 15. 
An X-linked carrier is a
a.
homozygous dominant female.
b.
heterozygous female.
c.
homozygous recessive female.
d.
homozygous male.
e.
heterozygous male.
 

 16. 
A human X-linked gene is
a.
found only in males.
b.
more frequently expressed in females.
c.
found on the Y chromosome.
d.
transmitted from father to son.
e.
found on the X chromosome.
 

 17. 
Who proposed the law of independent assortment?
a.
Morgan
b.
Mendel
c.
Sturtevant
d.
Weismann
e.
Flemming
 

 18. 
Gene mapping
a.
applies only to genes located on the same chromosomes.
b.
represents actual physical distance between genes.
c.
is based upon the frequency of crossing over.
d.
can be accomplished only by using the sex chromosomes.
 

 19. 
The failure of chromosomes to separate during mitosis or meiosis is called
a.
genetic displacement.
b.
trisomy.
c.
crossing over.
d.
nondisjunction.
e.
disjunction.
 

 20. 
The sex chromosome composition of a person with Turner syndrome is
a.
XXX.
b.
XO.
c.
XXY.
d.
XYY.
e.
none of these
 

 21. 
The sex chromosome composition of a person with Klinefelter syndrome is
a.
XXX.
b.
XO.
c.
XXY.
d.
XYY.
e.
none of these
 
 
Refer to the figure below to answer the following questions.

inheritquiz_files/i0230000.jpg
 

 22. 
In a series of mapping experiments, the recombination frequencies for four different linked genes of Drosophila were determined as shown in the figure. What is the order of these genes on a chromosome map?
a.
rb-cn-vg-b
b.
vg-b-rb-cn
c.
cn-rb-b-vg
d.
b-rb-cn-vg
e.
vg-cn-b-rb
 

 23. 
Cinnabar eyes is a sex-linked recessive characteristic in fruit flies. If a female having cinnabar eyes is crossed with a wild-type male, what percentage of the F1 males will have cinnabar eyes?
a.
0%
b.
25%
c.
50%
d.
75%
e.
100%
 
 
Refer to the information below to answer the following questions.

An achondroplastic male dwarf with normal vision marries a color-blind woman of normal height. The man's father was six-feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive.
 

 24. 
How many of their daughters might be expected to be color-blind dwarfs?
a.
all
b.
none
c.
half
d.
one out of four
e.
three out of four
 

 25. 
Male calico cats could be the result of
a.
sex-linked inheritance.
b.
nondisjunction, leading to the male calico having two X chromosomes.
c.
incomplete dominance of multiple alleles.
d.
recessive alleles retaining their fundamental natures even when expressed.
e.
a reciprocal translocation.
 



 
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