Transcript 1. The father of genetics is_____. A. Charles Darwin B

2. The inability of the dominant allele to make up for
the presence of the recessive allele is associated with
_____.
A. codominance
B. epistasis
___
C. incomplete dominance
D. pleiotropy
4. If the allele for red petals is not completely
dominant to the allele for white petals, when a truebreeding plant with red petals
is crossed with a true breeding plant with white
petals, the offspring will ____.
A. all have red petals
B. all have pink petals
___
C. all have white petals
D. all have red and white petals
5. When the plants with pink petals (R1R2) are
allowed to self-pollinate, the phenotypic ratio of the
offspring will be _____.
A. 3:1
B. 1:1:1:1
C. 1:2:1
___
D. 9:3:3:1
8. The appearance of both A and B types of
glycoproteins on the red blood cells of the people
with AB blood type is an
example of _______.
A. codominance
___
B. polygenic inheritance
C. epistasis
D. incomplete dominance
9. In _____, genes at two different loci interact to
control a single trait.
A. codominance
B. pleiotropy
C. polygenic inheritance
D. epistasis
___
10. Albinism is the result of _____.
___
A. epistasis
B. pleiotropy
C. codominance
D. incomplete dominance
11. If sweet peas are _____ in either gene for
pigmentation, a lack of color results.
A. homozygous dominant
B. heterozygous
C. homozygous recessive
___
12. An absence of color occurs when _____.
A. a gene is absent
B. an enzyme in a metabolic pathway is
___
missing
C. at least one dominant allele is present
13. Polygenic inheritance occurs when one trait is
governed by many genes occupying different loci on
______.
A. the same homologous pair of chromosomes
B. different homologous pairs of chromosomes
C. either A or B
___
D. neither A or B
14. More than two possible phenotypes for a
particular trait can be attributed to inheritance by
_____.
A. simple dominance
___
B. multiple alleles
C. epistasis
D. pleiotropy
15. Blood type in humans is controlled by _____
allele(s).
A. one
B. two
___
C. three
D. four
17. When there is a range of phenotypes, the
inheritance is _____.
A. polygenic
___
B. codominant
C. incompletely dominant
D. pleiotropic
19. When individuals make an abnormal form of the
extracellular matrix protein, fibrillin, which affects
many other traits, the
inheritance is the result of ______.
A. codominance
B. multiple alleles
C. simple dominance
___
D. pleiotropy
20. More phenotypes than expected may result from
polygenic inheritance because of _____.
A. multiple alleles
B. codominance
___
C. environmental effects
D. pleiotropy
22. Height in humans is affected by _____.
A. polygenic inheritance
B. environmental effects such as nutrition
___
C. both A and B
23. Environmental conditions can influence _____.
A. the skin color of humans
B. the fur color of rabbits
C. the appearance of a water buttercup
D. all of the above
___
27. Which of the following supports the
chromosomal theory of inheritance?
A. both chromosomes and alleles are paired in
diploid cells
B. homologous chromosomes and alleles
separate during meiosis
C. fertilization restores both the diploid
chromosome number and___
allele pairs in the zygote.
D. all of the above
28. Who determines the sex of the child?
A. the male
___
B. the female
30. The sex chromosomes of a human female are
_____.
A. XX
___
B. XY
C. YY
33. Male and female Drosophila flies have _____.
A. the same number of chromosomes as
humans
B. one pair of sex chromosomes
C. the same number of sex chromosomes as
humans
D. both B and C ___
34. The allele for Drosophila eye color ____.
A. is on the Y chromosome
___
B. is on the X chromosome
C. is on one of its autosomes
37. Which of the following best describes a
Drosophila with the genotype XRXr assuming XR =
red eyes and Xr = white eyes?
A. female with red eyes
B. female that is a carrier
C. male with white eyes
___
D. both A and B
38. Assuming XR = red eyes and Xr = white eye,
what is the phenotype of an individual with the
genotype XrY?
A. male with red eyes
B. male with white eyes
___
C. female with red eyes
D. female with white eyes
39. An individual with the genotype XrY will
produce which of the following gametes?
A. XR
B. Xr
C. Y
___
D. both B and C
43. If XB = normal vision and Xb = color blindness,
what are the chances a color blind female will have
color blind sons if she
has children with a man with normal vision?
___
A. 100%
B. 50%
C. 25%
D. none
44. What are the chances of a female, homozygous
for normal vision, and a color blind male having
color blind daughters?
A. 100%
B. 50%
C. 25%
___
D. none
45. Carriers can also be described as _____.
A. homozygous recessive
B. homozygous dominant
___
C. heterozygous
47. There is a direct relationship between the
frequency of crossing-over and the percentage of
recombinant __________.
A. gametes
B. phenotypes
C. genotypes
___
48. The chromosomes can be mapped by
determining the frequency of recombinant _____
that occurs due to the process of
crossing over.
___
A. gametes
B. phenotypes
C. genotypes
49. Drosophila chromosome II carries the gene for
_____.
A. antennae type
B. wing type
C. leg length
___
D. all of the above
50. If crossing over occurs between two linked
alleles of interest, a dihybrid produces _____ type(s)
of gamete(s).
A. one
B. two
C. three
D. four
___
51. When chromosomes are mapped by examining
recombinant phenotypes, it is assumed that 1% of
crossing over equals
_____ map unit(s).
___
A. one
B. two
C. five
D. ten
52. When individuals heterozygous for two traits that
have linked alleles are crossed the expected
phenotypic ratio of the
offspring is _____.
A. 1:1:1:1
B. 1:1
___
C. 3:1
D. 9:3:3:1
53. When a cross involving mutant genes b and e is
done 3% recombinants are observed. When a cross
involving mutant
genes t and e is done 22% recombinants are
observed. When a cross involving mutant genes b
and t is done 19%
recombinants are observed. What is the correct order
of the genes on the chromosome?
A. t, b, e
___
B. b, t, e
C. t, e, b
55. It is estimated that __________ of all flowering
plants are polyploids.
A. 21%
B. 47%
___
C. 68%
D. 92%
56. Triploids have _____ of each kind of
chromosome.
A. one
B. two
___
C. three
D. four
57. Nondisjunction can occur during meiosis I if
_____.
___
A. members of a homologous pair fail to
separate
B. the daughter chromosomes fail to separate
and instead go into the same daughter cell
C. both A and B
59. When an individual has only one of a particular
type of chromosome it's described as _____.
A. monosomy
___
B. disomy
C. trisomy
D. tetrasomy
62. Down syndrome is a _____.
A. monosomy
B. disomy
___
C. trisomy
D. tetrasomy
63. In humans, Turner syndrome _____.
A. is a monosomy
B. involves the sex chromosomes
C. results in a female
D. all of the above
___
64. Nondisjunction can occur during _____.
A. anaphase I
B. anaphase II
___
C. both A and B
65. A trisomy occurs when an individual has three of
_____.
A. a particular type of chromosome
___
B. each kind of chromosome
C. both A and B
67. Polyploidy generally results from _____.
A. mutation
B. hybridization
___
C. nondisjunction
68. Which of the following is a polyploid?
A. wheat
B. watermelons
C. cotton
D. all of the above
___
70. A(n) _____ is the movement of a segment of a
chromosome from one chromosome to another
nonhomologous
chromosome.
A. inversion
___
B. translocation
C. deletion
D. duplication
71. When a broken segment from one chromosome
attaches to its homologue a(n) _____ occurs.
A. duplication
B. deletion
C. inversion
___
D. both A and B
72. Which of the following may result in abnormal
gametes and offspring?
A. inversion
B. translocation
C. deletion
___
D. all of the above
75. Down syndrome that tends to run in the family of
either the mother or father is the result of _____.
A. deletion
B. inversion
C. duplication
D. translocation
___
76. Cri du chat syndrome is the result of a(n) _____.
A. inversion
B. translocation
C. deletion
D. duplication
___
78. Chromosomes may be broken by _____.
A. viruses
B. radiation
C. certain organic chemicals
D. all of the above
___
79. A(n) _____ occurs when a segment of
chromosome is turned around 180o.
A. inversion
___
B. translocation
C. deletion
D. duplication