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Test Booklet
Subject: SC, Grade: HS
Genetics Assessment
Student name:
Author: Megan Kitchens
School: SHAW HIGH SCHOOL
Printed: Monday January 30, 2017
Genetics Assessment
SC:HS
1 In fruit flies, the gray body color (G) is dominant
to the ebony body color (g). What is the genotypic
ratio of the offspring of a heterozygous gray
female and an ebony male?
A
B
C
D
25% Gg, 75% gg
50% Gg, 50% gg
75% gray, 25% ebony
100% gray
2 In Mendel’s experiments with a single trait, the
trait that disappeared in the first generation and
reappeared in the next generation is called the
A
B
C
D
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homozygous trait
dominant trait
recessive trait
heterozygous trait
Go On
Genetics Assessment
SC:HS
3 A scientist conducted a study of an organism and found that its body cells contained 40 chromosomes.
These cells were cultured in the laboratory, and cell division was observed. What difference, if any, would
the scientist expect to observe between body cell division and sex cell division in the organism?
A
B
C
D
Body cells divide by mitosis, and sex cells divide by meiosis.
Body cells divide by meiosis, and sex cells divide by mitosis.
There is no difference; body cells and sex cells both divide by mitosis.
There is no difference; body cells and sex cells both divide by meiosis.
4 According to Mendel’s law of segregation, which
6 In garden pea plants, the tall allele ( T ) is dominant
of the following statements describes what happens to the alleles of a gene pair?
to the short allele ( t ), and the round seed allele (
R ) is dominant to the wrinkled seed allele ( r ).
A The alleles are moved to different chromo-
Which of the following crosses could produce
short pea plants with wrinkled seeds?
somes.
B The alleles are mutated in the process of
mitosis.
C The alleles are separated during fertilization.
D The alleles are separated during gamete formation.
5 Which of the following laws or principles states
A
B
C
D
TtRr × TTRR
TTRr × TTRr
TtRr × Ttrr
TtRR × ttRR
7 In pea plants, the genes for seed color and seed
that the two alleles of a gene pair separate during
gamete formation?
shape are on different chromosomes. Which of the
following explains why the genes for these traits
are not inherited together?
A
B
C
D
A
B
C
D
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law of segregation
principle of linkage
principle of dominance
law of independent assortment
natural selection
artificial selection
the law of segregation
the law of independent assortment
Go On
Genetics Assessment
SC:HS
8 In fruit flies, the gene for red eye color® is dominant to the gene for white eye color®. The trait is sexlinked. What would be the genotype of a white-eyed female?
A
B
C
D
XRXr
XrXr
XRY
XrY
9 Assume that brown eyes (B) are dominant over tan
eyes (b) in guinea pigs. When a brown-eyed male
is mated with a tan-eyed female, 50% of the litter
has brown eyes and 50% has tan eyes. What is the
genotype of the female guinea pig?
A
B
C
D
BB
Bb
bB
bb
10 The phenotype of an animal depends MOST
directly on --
A
B
C
D
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how the genes of the animal are expressed.
the metabolic rate of the animal.
the source of the animal’s food.
how many cells are in the animal’s body.
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Genetics Assessment
SC:HS
11 In pea plants, “tall” is dominant to “short.” To determine if a tall pea plant is heterozygous or homozygous
for tallness, it should be crossed with a plant that is known to be —
A
B
C
D
purebred tall.
purebred short.
heterozygous tall.
heterozygous short.
12
In pea plants, the trait for being tall (T) is dominant over the trait for being short (t). What is the expected
phenotypic outcome of the F1 generation in the cross shown above?
A
B
C
D
100% short
50% tall
75% short
100% tall
13 A gardener planted red flowering plants in a
14 A dominant gene that codes for white hair is
garden. He crossed the red flowers with white
flowers, and the offspring flowers were pink. This
is an example of —
represented by the symbol W. If a parent with the
genotype WW is crossed with a parent of genotype
Ww, what percent of their offspring will have
white hair?
A
B
C
D
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incomplete dominance.
sex linkage.
multiple alleles.
homozygous inheritance.
A
B
C
D
25%
50%
75%
100%
Go On
Genetics Assessment
SC:HS
15 In corn plants, ragged leaves® are dominant to smooth leaves®. If two heterozygous ragged-leaf plants are
crossed, what are the possible genotypes of the offspring?
A
B
C
D
Rr only
Rr and rr only
RR and rr only
RR, Rr, and rr only
16 Assume that in humans there is a 50/50 chance that a child will be a boy. If a certain mother and father
have four sons, what are the chances that their fifth child will be a daughter?
A
B
C
D
1
2
1
5
1
16
1
25
17 In guinea pigs, the trait for ruffled fur is dominant over the trait for smooth fur. If a heterozygou male
is crossed with a homozygous recessive female, what percent of the offspring would be expected to have
ruffled fur?
A
B
C
D
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25%
50%
75%
100%
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Genetics Assessment
SC:HS
18
A woman with Type AB blood marries a man with Type B blood. According to the Punnett square, their
children could have each of these blood types EXCEPT —
A
B
C
D
Type A.
Type B.
Type AB.
Type O.
19
The trait for flower color in the plants shown above is controlled by incomplete dominance. What percent
of the offspring will have pink flowers?
A
B
C
D
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0%
25%
50%
100%
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Genetics Assessment
SC:HS
20 A woman who is colorblind ( X c X c ) can expect
—
A
B
C
D
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100% of her female offspring to be colorblind.
100% of her male offspring to be colorblind.
0% of her female offspring to be colorblind.
50% of her male offspring to be colorblind.
STOP