1. Inheritance Practice Test

2. Question #1 Which of the following does NOT describe a genotype?
Pair of alleles HH
Brown hair
Homozygous

3. Question #2
A father can pass an X-linked allele to ___. Write in ALL that apply.
All of his daughters
Half of his daughters
All of his sons
Half of his sons
None of his daughters
None of his sons

4. Question #3
A man and woman, both with type B blood, have a child with type O blood. What is the probability that their next child will have type O blood? 0%
25%
50%
75%
100%

5. Question #4
Blood type is an example of which mode of inheritance? Write in ALL that apply.
Incomplete dominance
Codominance
X-linked trait
Multiple alleles
Polygenic trait

6. Question #5
In a monohybrid, 25% of the offspring expressed the recessive trait. The genotypes of the parents must be
Both homozygous
Both heterozygous
One homozygous and one heterozygous
Not enough information is given

7. Question #6
Brown eyes are dominant over blue eyes. What is the probability that 2 blue eyed people can produce a brown eyed child? 0%
25%
50%
75%
100%

8. Question #7
Disease A is a dominant X-linked trait. Bob’s mother had the disease, but his father did not. Jane’s mother did not have the disease, but her father did. What are the possible genotypes for Bob and Jane?
Bob: XAY, XY; Jane: XX, XAX
Bob: XAY; Jane: XAXA
Bob: XY; Jane: XX
Bob: XY, XAY; Jane: XAX
None of the above

9. Question #8
Which mode of inheritance has the widest variety of phenotypes?
Complete dominance
Incomplete dominance
Codominance
X-linked traits
Polygenic traits

10. Question #9
The following pedigree shows an autosomal dominant trait. What are the possible genotypes of father in the top row? Use A.

11. Question #10
A parent makes the following gametes: bE, BE, bE, BE. What is that parent’s genotype?

12. Question #11
Curly hair is dominant to straight hair. Why is it that most people in a population have straight hair?