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WorksheetsPunnett Square Practice
Total questions: 20
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair)
a)
50 % Brown Hair and 50% Blond Hair
b)
25 % Brown Hair and 75% Blond Hair
c)
75 % Brown Hair and 25% Blond Hair
d)
0% Brown Hair and 100% Blond Hair
2.
The combination of genes a person has, represented by letters, is their...
a)
Genotype
b)
Phenotype
c)
Chromosome
d)
Punnett Square
3.
What belongs in the last box?
a)
RR
b)
Rr
c)
rr
d)
ff
4.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
5.
Look at the punnett square. What is the probability that the offspring would have homozygous alleles for the trait?
a)
100%
b)
75%
c)
50%
d)
25%
e)
0%
6.
Both parents in this Punnet square
a)
are homozygous dominant
b)
are homozygous recessive
c)
are heterozygous
d)
have blue eyes
7.
Fill in the Yellow Box
a)
Bb
b)
BB
c)
bb
8.
Which of the following allele pairs is heterozygous?
a)
RR
b)Qq
c)
ss
9.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
10.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
11.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
12.
AA and Aa always show up as
a)
dominant
b)
recessive
13.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
14.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
15.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
16.
Aa is
a)
homozygous
b)
heterozygous
17.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
18.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
19.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
20.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
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