Chapter 14 - Bio 1201 QUESTIONS AND ANSWERS
In his breeding experiments, Mendel first crossed true-breeding plants to produce
a second generation, which were then allowed to self-pollinate to generate the
offspring. How do we name these three generations?
A. P1 ... P2 ... F
B. F1 ... F2 ... F3
C. F ... P1 ... P2
D. P ... F1 ... F2
E. P1 ... P2 ... P3
D. P ... F1 ... F2
Which of the following is true about a plant with the genotype AABbcc?
A. It has recessive alleles at three loci.
B. It is triploid.
C. It is homozygous at two loci.
D. It will not express the recessive c allele.
E. It is heterozygous at two loci.
C. It is homozygous at two loci.
What is an allele?
A. a type of chromosome
B. the dominant form of a gene
C. the recessive form of a gene
D. an alternative version of a gene
E. a variety of pea plant used by Mendel
D. an alternative version of a gene
Consider pea plants with the genotypes GgTt and ggtt . These plants can each
produce how many type(s) of gametes?
,A. four ... one
B. one ... two
C. one ... one
D. four ... two
E. two... one
A. 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?
A. 1/4
B. 9/64
C. 4/3
D. 1/16
E. 3/4
D. 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 parental traits?
A. Both red and white are pleiotropic.
B. Red shows incomplete dominance over white.
C. Pink is dominant, and red and white are recessive.
D. Red is completely dominant.
B. Red shows incomplete dominance over white.
Height in humans generally shows a normal (bell-shaped) distribution. What type
of inheritance most likely determines height?
A. a combination of epistasis and environmental factors
B. a combination of complete dominance and environmental factors
C. incomplete dominance
D. a combination of multiple alleles and codominance
E. a combination of polygenic inheritance and environmental factors
, E. 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?
A. It is very likely that at least one of Woody Guthrie's parents also have had the
allele for Huntington's disease.
B. His sons will develop Huntington's disease but not his daughters.
C. All of his children will develop Huntington's disease.
D. His daughters will die of Huntington's disease but not his sons.
E. There is not enough information to answer the question.
A. It is very likely that at least one of Woody Guthrie's parents 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, which is the least invasive (list first), and
which two allow the chromosomes of the fetus to be examined?
A. amniocentesis ... fetoscopy ... chorionic villus sampling
B. amniocentesis ... ultrasound imaging ... chorionic villus sampling
C. chorionic villus sampling ... fetoscopy ... amniocentesis
D. ultrasound imaging ... fetoscopy... amniocentesis
E. ultrasound imaging ... chorionic villus sampling ... amniocentesis
E. ultrasound imaging ... chorionic villus sampling ... amniocentesis
Which of the following do you expect if an individual is heterozygous for the
sickle-cell trait?
A. He or she will be more apt to acquire a serious case of malaria.
B. He or she will not develop sickle-cell disease.
In his breeding experiments, Mendel first crossed true-breeding plants to produce
a second generation, which were then allowed to self-pollinate to generate the
offspring. How do we name these three generations?
A. P1 ... P2 ... F
B. F1 ... F2 ... F3
C. F ... P1 ... P2
D. P ... F1 ... F2
E. P1 ... P2 ... P3
D. P ... F1 ... F2
Which of the following is true about a plant with the genotype AABbcc?
A. It has recessive alleles at three loci.
B. It is triploid.
C. It is homozygous at two loci.
D. It will not express the recessive c allele.
E. It is heterozygous at two loci.
C. It is homozygous at two loci.
What is an allele?
A. a type of chromosome
B. the dominant form of a gene
C. the recessive form of a gene
D. an alternative version of a gene
E. a variety of pea plant used by Mendel
D. an alternative version of a gene
Consider pea plants with the genotypes GgTt and ggtt . These plants can each
produce how many type(s) of gametes?
,A. four ... one
B. one ... two
C. one ... one
D. four ... two
E. two... one
A. 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?
A. 1/4
B. 9/64
C. 4/3
D. 1/16
E. 3/4
D. 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 parental traits?
A. Both red and white are pleiotropic.
B. Red shows incomplete dominance over white.
C. Pink is dominant, and red and white are recessive.
D. Red is completely dominant.
B. Red shows incomplete dominance over white.
Height in humans generally shows a normal (bell-shaped) distribution. What type
of inheritance most likely determines height?
A. a combination of epistasis and environmental factors
B. a combination of complete dominance and environmental factors
C. incomplete dominance
D. a combination of multiple alleles and codominance
E. a combination of polygenic inheritance and environmental factors
, E. 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?
A. It is very likely that at least one of Woody Guthrie's parents also have had the
allele for Huntington's disease.
B. His sons will develop Huntington's disease but not his daughters.
C. All of his children will develop Huntington's disease.
D. His daughters will die of Huntington's disease but not his sons.
E. There is not enough information to answer the question.
A. It is very likely that at least one of Woody Guthrie's parents 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, which is the least invasive (list first), and
which two allow the chromosomes of the fetus to be examined?
A. amniocentesis ... fetoscopy ... chorionic villus sampling
B. amniocentesis ... ultrasound imaging ... chorionic villus sampling
C. chorionic villus sampling ... fetoscopy ... amniocentesis
D. ultrasound imaging ... fetoscopy... amniocentesis
E. ultrasound imaging ... chorionic villus sampling ... amniocentesis
E. ultrasound imaging ... chorionic villus sampling ... amniocentesis
Which of the following do you expect if an individual is heterozygous for the
sickle-cell trait?
A. He or she will be more apt to acquire a serious case of malaria.
B. He or she will not develop sickle-cell disease.
