WorksheetsPunnet Squares
Total questions: 14
Worksheet time: 19mins
Name
Class
Date
1.
A man, who has red-green colorblindness, and his wife, who is a carrier for colorblindness, have a colorblind son. What is the probability that their next son will also be colorblind?
a)
0%
b)
25%
c)
50%
d)
100%
2.
A woman heterozygous for A blood marries a man heterozygous for B blood. What is the probability that they will produce offspring with AB blood?
a)
0%
b)
25%
c)
50%
d)
75%
3.
What is the chance of two parents with blood types AB and O producing an offspring with blood type O?
a)
0%
b)
25%
c)
50%
d)
100%
4.
Black hair color is dominant to white hair color in mice. Determine the phenotypic ratio for the offpring of a heterozygous black mouse and a white mouse.
a)
4 Black: 0 White
b)
3 Black: 1 White
c)
2 Black: 2 White
d)
0 Black: 4 White
5.
Genetic crosses involving a particular type of flower exhibit complete dominance with respect to petal color. Red (R) is dominant to white (r). Using the Punnett square, what is the expected percentage of offspring that will have white flowers from a cross of parent flowers with a genotype of Rr.
a)
0%
b)
25%
c)
50%
d)
100%
6.
When a man has an allele combination Ww for a trait, what percentage of his gametes will have a dominant allele for that trait?
a)
25%
b)
50%
c)
75%
d)
100%
7.
Red-green color blindness is an X-linked recessive trait. A red-green color-blind woman and a red-green color-blind man have a son. What is the probability that the son is also red-green color-blind?
a)
0%
b)
25%
c)
50%
d)
100%
8.
A man with type O blood has children with a woman who is heterozygous for type A blood. What is the probability that their children will have type A blood?
a)
0%
b)
25%
c)
50%
d)
100%
9.
In a certain species of rabbits, black coat color is dominant over brown coat color. What is the probability of producing a rabbit with brown coat color from two rabbits that are both heterozygous for black coat color?
a)
0%
b)
25%
c)
75%
d)
100%
10.
Tay-Sachs disease is a lethal, autosomal recessive genetic disorder. If both parents are heterozygous carriers of the disease, what are the chances of them having a child who is also a heterozygous carrier for Tay-Sachs?
a)
0%
b)
25%
c)
50%
d)
75%
11.
Biologists have found that a form of deafness is a recessive trait in dogs. If a female dog that is heterozygous for the trait mates with a male dog that is deaf, what percent of their offspring will be deaf?
a)
0%
b)
50%
c)
75%
d)
100%
12.
Phenylketonuria (PKU) is inherited as a recessive condition. A man with PKU marries a woman without any alleles for PKU. What is the probability that their child will inherit PKU?
a)
0%
b)
25%
c)
50%
d)
75%
13.
Scott was looking at the results of a cross between red and white flowers. Which is the most likely result of a cross that demonstrates incomplete dominance?
a)
0%
b)
50%
c)
75%
d)
100%
14.
In certain species of plants, purple flowers (P) are dominant to white flowers (p). If two heterozygous plants are crossed, what will be the phenotype of the offspring?
a)
100% purple flowers
b)
100% white flowers
c)
75% white flowers, 25% purple flowers
d)
25% white flowers, 75% purple flowers
100 %
