Rh positive is a trait that shows simple dominance

9) Rh positive is a trait that shows simple dominance over Rh negative and is
designated by the alleles R and r, respectively. A third gene for the MN blood
group has codominant alleles M and N.
• Which of the following is a possible partial genotype for the son?
A) IBIB
B) IBIA
C) ii

33 Maadi STEM School – Biology Assistants
D) IBi
E) IAIA
Answer: D
10) Which of the following is a possible genotype for the mother?
11) Which of the following is a possible phenotype for the father? 12) Which of the following is the probable genotype for the mother?
13) Which describes the ability of a single gene to have multiple phenotypic
effects?
A) Incomplete dominance
B) Multiple alleles

34 Maadi STEM School – Biology Assistants
C) Pleiotropy
D) Epistasis
Answer: C
14) Which describes the ABO blood group system?
15) Which of the following terms best describes when the phenotype of the
heterozygote differs from the phenotypes of both homozygotes?
16) Which of the following is an example of polygenic inheritance? 17) Hydrangea plants of the same genotype are planted in a large flower garden.
Some of the plants produce blue flowers and others pink flowers. This can be best
explained by which of the following?
A) Environmental factors such as soil pH
B) The allele for blue hydrangea being completely dominant

35 Maadi STEM School – Biology Assistants
C) The alleles being codominant
D) The fact that a mutation has occurred
E) Acknowledging that multiple alleles are involved
Answer: A
18) Most genes have many more than two alleles. However, which of the following
is also true?