Use a double square (dihybrid cross) to determine the possible genotypes and phe
ID: 211156 • Letter: U
Question
Use a double square (dihybrid cross) to determine the possible genotypes and phenotypes for this couple’s child. Give percentages and show your work. Remember that blood type A and B are dominant, and blood type O is recessive. The Rh factor is inherited as dominant, and you should use (D, d) to track this. So, Rh+ is either DD or Dd, and Rh- is dd. Glenn has blood type A- and is heterozygous for A, Maggie has blood type O-. What are the possible genotype and phenotype outcomes for their child? In this case, is it possible that the child could have a phenotype different than at least one of its parents?
Explanation / Answer
For Glen the blood group is A-, genotype is IAIO dd
maggie has bllod group O.- , genotype=IOIO dd
IAIO dd X IOIO dd
IAd
IA d
IO d
IO d
IO d
IA IO d d
IA IO d d
IO IO d d
IO IO d d
IO d
IA IO d d
IA IO d d
IO IO d d
IO IO d d
For the chilldren the genotype will be either IAIO dd or IOIO
the phenotype will be A- or O-
there is no possibility that the child will have a phenotype different from any one of its parent.
IAd
IA d
IO d
IO d
IO d
IA IO d d
IA IO d d
IO IO d d
IO IO d d
IO d
IA IO d d
IA IO d d
IO IO d d
IO IO d d
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