Human Blood Types & Punnett Squares - Weebly

Name: ____________________________ Period:__________

Human Blood Types & Punnett Squares

Dominant/Recessive: Codominant:

Type A blood is dominant to Type O blood. Type O is recessive. Type B blood is dominant to Type O blood. Type O is recessive. Type A blood and Type B blood are codominant with each other.

1. Which possible baby blood phenotype(s) could parents with A and AB have:

( 3 Possible alleles: IA , IB , i ) (Possible Blood Phenotypes: A , B , AB , O)

a. Write the possible genotype(s) of Type A:

______________ IAIA or IAi ______________ b. Write the possible genotype(s) of Type AB:

__________ IAIB ______________

Blood type alleles: Type A uses IA Type B uses IB Type AB uses IAIB

c. Do the possible combinations of Punnett Square(s)

Type O uses i

d. What are possible offspring blood genotypes and phenotypes:

Genotype(s):_IAIA, IAIB, IAi, IBi_ ___Phenotype(s):_A, B, and AB_

IA

IB

IA

IB

IA IAIA IAIB

IA IAIA IAIB

IA IAIA IAIB

i IAi IBi

2. If one parent is type A and the other is type B and one of their children is type O, what are the parent's genotypes?

a. Write the genotype for a Type O offspring:

____ii_____________________

b. Write the possible genotypes for Type A:

IB

i

_____ IAIA or IAi ________

c. Write the possible genotypes for Type B:

IA IAIB IAi

_______ IBIB or IBi _________

d. Write the genotypes of the parents:

______ IAi or IBi ________

i IBi

ii

e. Write are all the possible offspring's' phenotypes:

____A, B, AB, and O____

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