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Pedigrees & Dihybrid Crosses

Total questions: 26

Worksheet time: 2hrs 45mins

Name
Class
Date
1.

For a Pedigree, Match the following...

a)

Male symbol

1.

Square

b)

Female Symbol

2.

Circle

c)

Affected Individual

3.

Shape Filled

d)

Individual NOT affected

4.

Shape Not filled

2.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
3.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
4.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)
8
b)
5
c)
2
d)
3
5.
Which gender can be carriers of colorblindness and not have it?
a)
Just males
b)
Just females
c)
Both genders
6.
How many people in this whole pedigree have the trait/disease?
a)
2
b)
3
c)
4
d)
6
7.

This is a pedigree that traces blue eyes, which is a recessive trait. While brown is dominant. What is the phenotype and genotype of the mother in generation 1?

a)

Brown eyes

b)

Blue eyes

c)

BB

d)

bb

e)

Bb

8.

If this pedigree is tracing a recessive disorder, what is the genotype of individual II-3?

a)
HH
b)
Hh
c)
hh
d)

heterozygous

9.

This is a pedigree that traces freckles, which is a dominant trait. What is the genotype of the father in generation 1?

a)

Aa

b)

AA

c)

aa

10.

Cystic Fibrosis is a recessive trait. Which genotype(s) will NOT have cystic fibrosis?

a)

CC

b)

Cc

c)

cc

11.

Cystic Fibrosis is a recessive trait. What is the genotype of Bill?

a)

CC

b)

Cc

c)

cc

12.

This pedigree is tracing straight thumbs, which are dominant. What is the genotype and phenotype of II-2?

a)

TT

b)

Tt

c)

tt

d)

straight thumb

e)

not straight thumb

13.

This pedigree is tracing straight thumbs, which are dominant. What is the genotype and phenotype of II-5?

a)

TT

b)

Tt

c)

tt

d)

straight thumb

e)

hitchhiker's thumb

14.

This pedigree shows family members that have Tay Sachs, a recessive disease. What is II-3's genotype?

a)

GG

b)

Gg

c)

gg

15.

This pedigree shows family members that have Tay Sachs, a recessive disease. What is IV-1's genotype?

a)

GG

b)

Gg

c)

gg

16.

This pedigree shows family members that have Tay Sachs, a recessive disease. Would the carriers have the disease?

a)

Yes because they would have one recessive allele

b)

Yes because they would have two recessive alleles

c)

No because they would have one dominant allele

17.
What goes in box 3
a)
Aabb
b)
AABB
c)
AAbb
d)
aaBb
18.

What goes in box 15

a)

aabb

b)

AABB

c)

aaBB

d)

AAbb

19.
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
20.
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.
21.

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
22.

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

23.

If you have a parent who has GgBb as their genotype, what are the possible alleles they could donate to their gametes (outcome of foil)

a)

GB, GB, gb, gb

b)

GB, Gb, gB, gb

c)

GG, BB, gg, bb

d)

Gb, Gb, Gb, GB

24.

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

25.

What are the possible gametes that can be formed from these alleles? FOIL!

a)
AB, AB, aB, aB
b)
Ab, AB, Ab, ab
c)
Ab, Ab, Ab, Ab
d)
AB, aB, ab, aB
26.

A way to predict genetic probability using two different

sets of alleles on two different chromosomes.

a)

Co-Dominance

b)

Incomplete Dominance

c)

Monohybrid Cross

d)

Dihybrid Cross