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Worksheetsmonohybrid practice
Total questions: 12
Worksheet time: 39mins
Name
Class
Date
1.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
2.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
3.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
4.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
5.
An organism’s physical appearance, or visible traits
a)
Recessive
b)
Genotype
c)
Phenotype
d)
Heterozygous
6.
An organism’s genetic makeup, or allele combinations
a)
Recessive
b)
Genotype
c)
Phenotype
d)
Heterozygous
7.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
8.
In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short
b = long
What would the cross be for two heterozygous guinea pigs?
B = short
b = long
What would the cross be for two heterozygous guinea pigs?
a)
BB X BB
b)
BB X Bb
c)
Bb X Bb
d)
bb X bb
9.
Smooth seeds are dominant over wrinkled seeds.
What is the genotype ratio for the following cross?
Nn X NN
What is the genotype ratio for the following cross?
Nn X NN
a)
NN = 100%, Nn = 0%, nn = 0%
b)
NN = 50%, Nn = 25%, nn = 25%
c)
NN = 50%, Nn = 50%, nn = 0%
d)
NN = 25%, Nn = 50%, nn = 25%
10.
One of the two forms of a gene is called a(n)
a)
genotype
b)
allele
c)
hybrid
d)
trait
11.
Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?
a)
100% tall
b)
50% tall, 50% short
c)
75% tall, 25% short
d)
25% tall, 75% short
12.
Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?
a)
100% Gg
b)
50% GG, 50% Gg
c)
25% GG, 50% Gg, 25% gg
d)
75% Gg, 25% gg
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