Inheritance Practice Test

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.

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%

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%

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)

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

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

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

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

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

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