WorksheetsDihybrid Crosses
Total questions: 10
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.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
a)
0%
b)
25%
c)
50%
d)
100%
4.
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
5.
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
6.
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.
7.
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
8.
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
9.
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
10.
A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.
This cross would be
a)
BBEE x bbee
b)
BBEe x BbEe
c)
BbEE x BbEe
d)
BBee x BBEE
Answer KeyDihybrid Crosses
Total questions: 10
1.
a) Aabb
2.
a)
aabb
3.
d) 100%
4.
d) Rryy
5.
c) 3
6.
b) two traits are crossed.
7.
b)
3/16
8.
c)
1/16
9.
c)
RRYy
10.
a)
BBEE x bbee
140 %