Download Patterns of Inheritance Worksheet #2

Name: _______________________________
Date: ________________________________
Due: ________________________________
Patterns of Inheritance Worksheet #2
Answer each of the following questions in the space provided.
For each problem, show all your work.
1. Purebred organisms always produce offspring with the same trait when bred with other
purebreds. In other words, the offspring of purebred organisms are just like the parents in
one or more traits. A purebred female cat with a tail is crossed with a purebred male cat
without a tail. The resulting offspring have tails. Using this information, answer the following
questions.
a. What trait is dominant?
b. What is the genotype of the male cat?
c. What is the phenotype of the female cat?
d. What is the phenotype of the offspring?
e. What is the genotype of the offspring?
f.
In the space below, draw a Punnett square representing the cross described above.
Be sure to follow the steps for solving genetics problems.
2. Tongue rolling is a trait showing simple dominance. John is heterozygous for tongue rolling.
His wife Sarah has the recessive condition and cannot roll her tongue. If John and Sarah
have children, what is the likelihood that they will be able to roll their tongues? Be sure to
show the resulting genotypes and phenotypes of this cross.
3. In reebops, 3 body segments is dominant to 2 body segments. Use a Punnett square to
show that two parent reebops with 2 body segments cannot have a baby reebop with 3 body
segments. State the phenotype and genotype of the possible offspring.
4. In humans, curly hair is dominant to straight hair. Both Joan and her husband have curly
hair. She is homozygous for the trait while he is heterozygous. Will their children have
straight or curly hair? Use a Punnett square to support your answer.
5. John wants to breed mice to make money. A research center has agreed to pay him $2.00
for every albino mouse produced. Knowing that albinism is a recessive condition, John
crosses a male mouse that is homozygous for the dominant brown color with an albino
female. What percent of the offspring will have white hair? Is this a good money making
strategy? Show your work.
6. Sue has a guinea pig with black hair and wants to know if the guinea pig is homozygous or
heterozygous for this dominant trait (white hair is the recessive trait). What should she cross
the guinea pig with to determine the genotype? Show your work.