Question

1. Give the genotypes for the following circumstances:
   1. Type O blood. __________
   2. Type AB blood. __________
   3. Type A blood (two possibilities). _____________________
   4. Type B blood (two possibilities). _____________________
      
2. A person with type O blood mates with a person with type AB blood. Complete a punnett square.
   
   
   1. What percentage of the offspring will have type B blood? _________
   2. What percentage of the offspring are homozygous recessive? _________
      
3. A person who is heterozygous for type A blood mates with a person who is heterozygous for type B blood. Complete a punnett square.
   
   
   
   1. What percentage of the offspring will have AB blood? ________
   2. What percentage will have type O? _________
      
4. A person with Type AB blood mates with another person with Type AB blood. Complete the punnett square.
   
   
   
   1. What percentage of the offspring have Type AB blood? _______
   2. Do any of the offspring contain any recessive alleles? _______

Answer 1

Type O blood genotype=OO

Type A blood genotype= AA or AO since O is recessive to A and B

Type B blood genotype=BB or BO since O is recessive to A and B

50% of offspring will have B blood type in a cross between AB and O blood type

0% are homozygous recessive as there is no OO blood type

25% offspring will have AB blood in cross between AO and BO blood type

25% offspring will have OO blood in cross between AO and BO blood type

50% offspring will have AB blood type in cross between two AB parents

There is no recessive alleles as both A and B shows co-dominance.