Bikini Bottom: Blood Type Genetics And Codominance (Page 4 of 6) in pdf

Bikini Bottom: Blood Type Genetics And Codominance Page 4

9. In a heterozygous I

i person, which allele is dominant, I

or i? Explain your reasoning, but

do not use capitalization of allele letter as a reason!

Codominance is when two alleles of a gene both influence the phenotype of an individual. Neither

allele is recessive; both alleles are dominant.

10. Which one of the genotypes you listed in question 8 results in a phenotype that provides

evidence of codominance? Hint: look back at the diagrams of the antigens.

11. Draw a picture of a red blood cell for the genotype you identified in question 10 to illustrate

how both alleles influence blood type in this case.

12. Each biological parent gives one of their two blood type alleles to their child. For example, a

father who has blood type AB has the genotype ______, so he will produce sperm with

either an I

or an I

allele; he can give either an I

or an I

allele to his child. If the mother

has blood type O, her genotype must be _____, and she can only give an _____ allele to

her child.

13. Complete the Punnett square shown below for the parents mentioned in question 12.

a. What is the percent chance of having a child with type A blood? _____

b. What is the percent chance of having a child with type B blood? _____

c. What is the percent chace of having a child with type AB blood? _____

d. What is the percent chance of having a child with type O blood? _____

14. Create a Punnett square for a mother who has type A blood and a father who has type B

blood. Determine the percent chance of these parents having a child with type O blood.

Bikini Bottom: Blood Type Genetics And Codominance Page 4