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WorksheetsDihybrid Crosses
Total questions: 17
Worksheet time: 26mins
Name
Class
Date
1.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
2.
What goes in box 15
a)
aabb
b)
AABB
c)
aaBB
d)
AAbb
3.
What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?
a)
Ry
b)
RRyy
c)
RrYy
d)
Rryy
4.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)
9
b)
2
c)
3
d)
6
5.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
6.
Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
7.
Based off this punnett square, what fraction of the offspring will have wrinkled, green seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
8.
What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?
a)
RrYy
b)
RRyy
c)
RRYy
d)
rryy
9.
What gamete possibilities could come from this parent's genotype?
a)
AB, AB, aB, aB
b)
Ab, AB, Ab, ab
c)
Ab, Ab, Ab, Ab
d)
AB, aB, ab, aB
10.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
11.
Based off this punnett square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
12.
AA and Aa always show up as
a)
dominant
b)
recessive
13.
What goes in box 6
a)
AaBB
b)
AABB
c)
aaBB
d)
AAbb
14.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
15.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
16.
What gamete possibilities could come from this parent's genotype?
a)
aB, ab, AB, Ab
b)
aB, Ab, AB, AB
c)
AB, aB, AB, Ab
d)
aB, ab, aB, ab
17.
What goes in box 2
a)
AABb
b)
AaBb
c)
aabb
d)
AaBB
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