WorksheetsPunnett squares review
Total questions: 11
Worksheet time: 21mins
Name
Class
Date
1.
Match the following combinations of alleles:
a)
Homozygous dominant
1.
DD
b)
Homozygous recessive
2.
dd
c)
Heterozygous
3.
Dd
2.
Two parents are both heterozygous. They both have brown eyes. What are the chances their child will also have brown eyes?
a)
25%
b)
75%
c)
100%
d)
50%
3.
Two heterozygous parents produce offspring. What is the probability of the HOMOZYGOUS DOMINANT GENOTYPE appearing in the offspring generation?
a)
75%
b)
25%
c)
50%
d)
100%
4.
What is it called when both alleles in a genotype are the same?
a)
Dominance
b)
Heterozygous
c)
Homozygous
d)
Recessiveness
5.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
6.
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%
7.
What is the mother's genotype?
a)
DD
b)
Dd
c)
dd
8.
How chance the offspring born from this cross will have a homozygous dominant genotype?
a)
25%
b)
50%
c)
75%
d)
100%
9.
Johnny eats food that still had pesticides residue on it. In his late 60s he is diagnosed with cancer due to the pesticides in his body. What was this mutation caused by?
a)
Chemicals
b)
Environment
c)
Errors in meiosis 1
d)
Errors in mitosis
10.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
11.
A Jawa notices that his beloved pet desert rat, who has brown fur, just had several rat babies, some of which had white fur and some which had brown fur. Brown fur is the dominant trait. This means his rat must have what genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
100 %
