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WorksheetsPunnett Square Quick Intro
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring. (Be sure to remember that the capital letter is dominant).
a)
50% heterozygous and 25% homozygous recessive
b)
50% heterozygous and 50% homozygous recessive
c)
100% homozygous recessive
d)
25% heterozygous and 50% homozygous
2.
A tall plant (TT) is crossed with a tall plant (Tt). What is the phenotype of the offspring?
a)
50% homozygous dominant; 50% heterozygous; 100% tall
b)
100% homozygous dominant; 100% tall
c)
25% homozygous dominant; 75% heterozygous; 100% short
d)
50% homozygous dominant; 50% heterozygous; 100% short
3.
A tall plant (Tt) is crossed with a short plant (tt). What is the genotype of the offspring?
a)
25% heterozygous; 75% homozygous
b)
100% homozygous dominant
c)
100% heterozygous
d)
50% heterozygous; 50% homozygous dominant
4.
A tall plant (Tt) is crossed with a short plant (tt). What is the phenotype of the offspring?
a)
75% tall; 25% short
b)
25% tall; 75% short
c)
50% tall; 50% short
d)
100% tall
5.
A white flower (rr) is crossed with a white flower (rr). What is the genotype of the offspring? Draw a Punnett square and answer the question.
a)
100% homozygous dominant
b)
100% heterozygous dominant
c)
100% homozygous recessive
d)
100% heterozygous recessive
6.
A white flower (rr) is crossed with a white flower (rr). What is the phenotype of the offspring? Draw a Punnett square and answer the question.
a)
100% white
b)
75% white; 25% red
c)
75% red; 25% white
d)
100% red
7.
A black chicken (BB) is crossed with a black chicken (BB). What is the genotype and phenotype of the offspring? Draw a Punnet square and naswer this question.
a)
100% heterozygous; 50% black
b)
100% homozygous dominant; 100% black
8.
A red flower (Rd) is crossed with a white flower (rr). What is the genotype of the offspring? Draw a Punnett square and answer this question.
a)
50% heterozygous; 50% homozygous dominant
b)
100% homozygous dominant
c)
100% homozygous recessive
d)
50% heterozygous; 50% homozygous recessive
9.
A homozygous dominant brown mouse (BB) is crossed with a heterozygous brown mouse (tan is the recessive color). List the offspring genotype and phenotype.
a)
50% homozygous dominant; 50% heterozygous and 100% tan
b)
25% homozygous dominant; 75% heterozygous; 100% brown
c)
50% homozygous dominant; 50% heterozygous and 100% brown
d)
75% homozygous dominant; 25% heterozygous and 100% tan
10.
Two heterozygous white (brown fur is recessive) rabbits are crossed. What is their genotype?
a)
25% homozygous domestic; 25% homozygous recessive; 50% heterozygous
b)
50% homozygous dominant; 50% heterozygous
c)
25% homozygous domestic; 75% homozygous recessive
11.
Two heterozygous white(brown fur is recessive) rabbits are crossed. What is the phenotype of the offspring?
a)
75% white; 25% brown
b)
25% white; 75 % brown
12.
Two heterozygous red flowers (white flowers are recessive) are crossed. What is the genotype of the offspring?
a)
75% homozygous dominant; 25% heterozygous
b)
50% homozygous dominant; 50% heterozygous
c)
25% homozygous dominant; 25% homozygous recessive; 50% heterozygous
13.
Two heterozygous red flowers (white flowers are recessive) are crossed. What is the phenotype of the offspring?
a)
50% red; 50% white
b)
75% white; 25% red
c)
25% red; 25% pink; 50% white
d)
75% red; 25% white
14.
A homozygous tall plant (TT) is crossed with a heterozygous tall plant (Tt) (short is the recessive phenotype). What are the genotypes and phenotypes of the offspring?
a)
100% homozygous dominant; 100% tall
b)
50% homozygous dominant; 50% heterozygous and 100% tall
c)
25% heterozygous; 75% homozygous dominant and 100% tall
15.
A heterozygous white rabbit is crossed with a homozygous black rabbit. List the parent genotypes; draw and fill and Punnett square, and then list the offspring genotypes and phenotypes.
a)
genotype-25% heterozygous; 75% homozygous recessive and phenotype-50% white and 50% black
b)
genotype- 50% heterozygous; 50% homozygous recessive and phenotype- 50% white and 50% black
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