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Complete Dominance & Punnett Squares

Total questions: 30

Worksheet time: 36mins

Name
Class
Date
1.

The physical appearance of a trait is known as its (a)   .

2.

What type of dominance is shown in the picture?

a)

Complete dominance

b)

Incomplete dominance

c)

Codominance

3.

Which of the following best describes the genotype "Rr"?

a)

recessive

b)

heterozygous

c)

purebred

d)

all of the above

4.

How would you write a homozygous dominant genotype?

a)

AA

b)

Aa

c)

aa

d)

either AA or Aa

5.

Which of the following genotypes is dominant?

a)

AA

b)

Aa

c)

aa

d)

both AA and Aa

6.

Which of the following genotypes are homozygous?

a)

Aa

b)

BB

c)

dd

d)

BB and dd

7.

If tall plants are dominant and short plants are recessive, how would you write the genotype for a homozygous tall plant?

a)

BB

b)

Bb

c)

bb

8.

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

a)

FF

b)

Ff

c)

ff

9.

If brown eyes are dominant and blue eyes are recessive, what color eyes do the parents in this Punnett Square have?

a)

one has brown eyes and the other has blue eyes

b)

they both have blue eyes

c)

they both have brown eyes

d)

there's no way to tell based on this information

10.

Which of these Punnett squares represents a cross between a homozygous dominant parent and a heterozygous parent?

a)
b)
c)
d)
11.

In pea plants, being tall is dominant and being short is recessive. Two tall plants mate. One has the genotype Tt and the other has the genotype TT. What is the chance that they will have a tall offspring?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

12.

If both parents have the genotype Aa, what is the chance their offspring will also have the genotype Aa?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

13.

In humans, being able to curl your tongue is a dominant trait and NOT being able to curl you tongue is a recessive trait. If a mom with the genotype Rr has a child with a dad with the genotype Rr, what is the probability that their child will be able to curl its tongue?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

14.

A dog with straight fur (Bb) is crossed with a dog with curly fur (bb). What is the probability the offspring will have straight fur?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

15.

In rabbits, black fur is dominant and white fur is recessive. If two white rabbits mate, what is the chance that they will produce an offspring with black fur?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

16.

Cody crosses a plant producing wrinkled peas with a plant producing smooth peas. Weeks later, he discovers that all the offspring plants have smooth peas. Cody drew the Punnett square above to show the genotypes of the offspring plants. What were the genotypes of the parent plants?

a)

RR and rr

b)

Rr and Rr

c)

RR and Rr

d)

Rr and rr

17.

Cody crosses a plant producing wrinkled peas with a plant producing smooth peas. Weeks later, he discovers that all the offspring plants have smooth peas. Cody drew the Punnett square above to show the genotypes of the offspring plants. Which is the dominant phenotype in the pea plants used in Cody’s experiment?

a)

smooth

b)

wrinkled

c)

RR

d)

Rr

18.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
19.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
20.

Gretford is heterozygous for his head shape. If (R) is for a Round head, and (r) is for an Egg head, what is Gretford's genotype?

a)

RR

b)

Rr

c)

rr

d)

rR

21.

What is the probability of heterozygous offspring?

a)

25%

b)

50%

c)

0%

d)

100%

22.

In plants, tall (T) is dominant to short (t).


Draw a punnett square and perform the following cross: Tt x Tt


What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

23.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
24.

What genotype would go in box 2? And is it Homozygous or Heterozygous?

a)

BB Heterozygous

b)

Bb Heterozygous

c)

bb Homozygous

d)

Bb Homozygous

25.

Kyree is heterozygous. If (W) is for waves, and (w) if for no waves.


What is Kyree’s genotype & phenotype?

a)

WW : waves

b)

ww : waves

c)

Ww : no waves

d)

Ww : Waves

26.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
27.

Brown eye color is dominant to blue eyes. Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

a)

0 %

b)

25%

c)

50%

d)

75%

28.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
29.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
30.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr