Punnet Squares and Answers

Part IA

Punnett Square

A o

A AA Ao

B AB Bo

1 . The possible phenotypes for the genotypes produced by our couple are the possible blood types . For this pairing , the possible blood types are A , B and AB

2 . We can see from our Punnett Square that two out of four possible combinations result in an A blood type . One out of four combinations each produce an AB and a B blood type . This translates to a 50 chance of the child being of blood type A

and a 25 chance that the child will have blood type AB and 25 chance the child will be a B

3 . The only blood type which is not possible is a blood type of O

PartIB

Completed Punnett Square - BO Genotype

B O

A AB Ao

B BB Bo

Completed Punnett Square - BB Genotype

B B

A AB AB

B BB BB

1 . The only blood types which can be produced in the offspring are the A , B , and AB blood types

2 . Three out of eight genotypes correspond to an AB . Four genotypes out of eight correspond to a B and one out of eight results in an A blood type phenotype . We can therefore say that a B blood type is most likely with 50 probability of occuring followed by AB with 37 .5 and A is last with a probability of 12 .5

3 . The offspring cannot have an O blood type as no possible pairing produces...