In his breeding experiments, Mendel first crossed true-breeding _____ generation plants to produce the
_____ generation, which were then allowed to self-pollinate to generate the _____ offspring. (Concept
14.1)
a. F ... P1 ... P2
b. P1 ... P2 ... P3
c. P ... F1 ... F2
d. P1 ... P2 ... F
e. F1 ... F2 ... F3 - c. P ... F1 ... F2
A plant with the genotype AABbcc _____. (Concept 14.1)
a. Will not express the recessive c allele.
b. is triploid
c. has recessive alleles at three loci
d. is homozygous at two loci
e. is heterozygous at two loci - d. is homozygous at two loci
An allele is _____. (Concept 14.1)
a. a type of chromosome
b. a variety of pea plant used by Mendel
c. the recessive form of a gene
d. an alternative version of a gene
e. the dominant form of a gene - d. an alternative version of a gene
GgTt pea plants can produce _____ type(s) of gametes, but a ggtt plant can produce _____ type(s) of
gametes. (Concept 14.2)
a. four ... two
b. one ... one
,c. one ... two
d. four ... one
e. two... one - d. four ... one
Two organisms with genotype AaBbCcDdEE mate. These loci are all independent. What fraction of the
offspring will have the same genotype as the parents? (Concept 14.2)
a. 1/4
b. 3/4
c. 1/16
d. 9/64
e. 4/3 - c. 1/16
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one. All of the
F1 are pink. What does this say about the alleles for the parental traits? (Concept 14.3)
a. Pink is dominant, while red and white are recessive.
b. Red is completely dominant.
c. Both red and white are pleiotropic.
d. Red and white are codominant.
e. Red shows incomplete dominance over white. - e. Red shows incomplete dominance over white.
Height in humans generally shows a normal (bell-shaped) distribution. What type of inheritance most
likely determines height? (Concept 14.3)
a. incomplete dominance
b. A combination of polygenic inheritance and environmental factors.
c. A combination of multiple alleles and codominance
d. A combination of complete dominance and environmental factors.
e. A combination of epistasis and environmental factors. - b. A combination of polygenic inheritance and
environmental factors.
, Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disorder. Which
statement below must be true? (Concept 14.4)
a. His daughters will die of Huntington's disease but not his sons.
b. All of his children will develop Huntington's disease.
c. At least one of Woody Guthrie's parents must also have had the allele for Huntington's disease.
d. His sons will develop Huntington's disease but not his daughters.
e. There is not enough information to answer the question. - c. At least one of Woody Guthrie's parents
must also have had the allele for Huntington's disease.
Various procedures can be used to detect genetic disorders before birth. Among the tests discussed in
this chapter, _____ is the least invasive, while _____ and _____ allow the chromosomes of the fetus to
be examined. (Concept 14.4)
a. amniocentesis ... fetoscopy ... chorionic villus sampling
b. ultrasound imaging ... chorionic villus sampling ... amniocentesis
c. amniocentesis ... ultrasound imaging ... chorionic villus sampling
d. ultrasound imaging ... fetoscopy... amniocentesis
If an individual is heterozygous for the sickle-cell trait _____. (Concept 14.4)
a. he or she will show no symptoms of the disease because the allele that causes sickle-cell disease is
recessive
b. he or she will be more apt to acquire a serious case of malaria
c. he or she will not develop full-blown sickle-cell disease but may show symptoms under certain
circumstances
d. he or she will have full-blown sickle-cell disease because the allele is dominant
e. none of the above - a. he or she will show no symptoms of the disease because the allele that causes
sickle-cell disease is recessive
Dd is crossed with a Dd. Squres labeled clockwise from top left
Which of the plants will br true-breeding?
A) 1-4
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