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WorksheetsGenetics Test Review
Total questions: 40
Worksheet time: 30mins
Name
Class
Date
1.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
2.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
3.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
4.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
5.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
6.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
7.
In the punnett square shown, what is the genotypes of the two parents?
a)
RW and RR
b)
RW and WW
c)
RR and WW
d)
RW and RR
8.
Which of the following is a phenotype?
a)
Aa
b)
black hair
c)
heterozygous genes
d)
mutated DNA
9.
An allele that is masked when a dominant allele is present. The "weaker" gene.
a)
Dominant Allele
b)
Recessive Allele
10.
An organism’s genetic makeup or allele combination.
a)
Genotype
b)
Phenotype
c)
Beanotype
d)
Notype
11.
An organism’s physical appearance, or visible traits.
a)
Genotype
b)
Phenotype
c)
Beanotype
d)
Notype
12.
An organism that has one dominant and one recessive allele for height is _____.
a)
unusual
b)
homozygous
c)
mutated
d)
heterozygous
13.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
14.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
15.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
16.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
17.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair)
a)
50 % Brown Hair and 50% Blond Hair
b)
25 % Brown Hair and 75% Blond Hair
c)
75 % Brown Hair and 25% Blond Hair
d)
0% Brown Hair and 100% Blond Hair
18.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).
a)
100 % tan
b)
100 % brown
c)
50 % brown and 50% tan
d)
75 % brown and 25 % tan
19.
A heterozygous yellow pea plant's genotype would be:
a)
YY
b)
yy
c)
Yy
d)
Yg
20.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
21.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
22.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
23.
What genotype would go in box 2?
a)
BB
b)
Bb
c)
bb
24.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
25.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
26.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
27.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Justin Bieber
28.
T = tall an t = short
What is the phenotype for Tt?
What is the phenotype for Tt?
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
29.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
30.
How many pairs of chromosomes are in a sex cell?
a)
46
b)
23
c)
26
d)
43
31.
If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
32.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
33.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
34.
Mutations can be...
a)
Harmful
b)
Beneficial
c)
Neutral
d)
All of the Above
35.
Your enzymes can repair some mutations
a)
True
b)
False
36.
Mutations are...
a)
Changes in the sequence of DNA
b)
Broken chromosomes
c)
Bad genes
37.
Which of the following is an example of a beneficial mutation?
a)
When an organism's lifespan becomes shorter.
b)
When an organism becomes unable to reproduce.
c)
When an organism's body becomes deformed.
d)
When an organism develops immunity to a disease.
38.
What mutation has occurred here?
T-G-A-C-C-A
T-G-A-G-C-A
a)
Substitution
b)
Deletion
c)
Insertion
d)
Frameshift
39.
Original: ATC CAT
Mutation: ATC GCAT
What mutation occurred?
a)
deletion
b)
insertion
c)
silent
d)
transverse
40.
DNA molecule segment is : TTA-CGC-AAG
The mutated DNA segment is TTC-GCA-AG. This is an example of ___ mutation.
a)
Substitution
b)
Deletion
c)
Insertion
d)
Inversion
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