1. Inheritance Practice Test

2. Question #1
The genotypes that CANNOT be determined by inspecting the phenotypes of the offspring of a cross are:
homozyg domin. & homozyg recess.
codominant & incomplete dominant
codominant & homozyg. recess.
homozyg. domin. & heterozyg. domin.

3. Question #2
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%

4. Question #3
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%

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
Multiple genes (polygenic)

6. Question #5
Which type of inheritance has the widest variety of phenotypes?
Incomplete dominance
Codominance
X-linked traits
Polygenic traits

7. Question #6
A father can pass an X-linked recessive allele to ___. (He/she will express it.)
All of his daughters
Half of his daughters
All of his sons
None of this offspring

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

9. Question #8
The following pedigree shows an autosomal dominant trait. What are the possible genotypes of father in the top row? Use A.

10. Question #9
A parent makes the following gametes: bE, BE, bE, BE. What is that parent’s genotype?

11. Question #10
Curly hair is dominant to straight hair. Why is it that most people in a population have straight hair?