Punnett Squares Part 3 Blood typing Blood Typing

Punnett Squares Part 3 Blood typing

Blood Typing

Blood Type Red blood cells have special proteins on their surfaces. Some have… • A proteins (Type A) • B proteins (Type B) • both A and B proteins (Type AB) • neither A nor B proteins (Type O)

Blood antibodies • You also have proteins called antibodies floating in your blood • These antibodies attack foreign substances in your body by attaching to them like puzzle pieces • Normally, you do not make antibodies that attack your own cells

Which blood alleles are Dominant? Recessive? Which genotypes are Homozygous? Heterozygous? Type O is recessive to all other types.

Genotypes and Phenotypes Step #1: Make a KEY!! Genotype: Phenotype: AA = A Homozygous Dom = Type A AO = A Heterozygous = Type A BB = B Homozygous Dom = Type B BO = B Heterozygous = Type B AB = AB… Type AB OO = O Homozygous Rec = Type O

Quickcheck Q#1 Step 2: highlight the parent’s genotypes If the father is type AB and the mother is type A heterozygous, what could the genotypes and phenotypes of the children be? Step 3: Solve the Punnett square! Step 4: give the possible genotypes and phenotypes Step 5: Answer the question!

Quickcheck Q#2 If the father is type A homozygous and the mother is type B heterozygous, what blood types could the children have? Make a Punnett square!

Quickcheck Q#3 If the father is type AB and the mother is type O, what is the possibility of having a child who is type A? Type B? AB? O? Make a Punnett square!