Genetic Problems# 2: Show all work in pencil Name______

1.  Human blood typing is a multiple alleled trait (A, B, O).

Cross Heterozygous type B with type AB.

Alleles =

Parental genotypes =

Offspring genotype(s) =

Offspring phenotype(s) =

2.  Suppose two newborn babies were accidentally mixed up in a hospital. Use to Punnett squares below to figure out the genotypes of all of the individuals. Once the genotypes are known, the babies can be returns to their biological parents.

Baby 1: Type A Baby 2: Type O Mrs. Allen: Type B

Mr. Allen: Type O Mrs. Jones: type O Mr. Jones: type AB

Name / Genotype
Mrs. Allen
Mr. Allen
Mrs. Jones
Mr. Jones
Baby 1
Baby 2

Mr. and Mrs. Allen Mr. and Mrs. Jones

3. 

Which baby belongs to Mr. & Mrs. Allen? Which baby belongs to Mr & Mrs.Jones?

3.  Mr. Cash dies and left all his money to his two children. A young man claiming to be a lost third child sued for his share of the estate. The judge ordered blood tests for all family members and for the young man. Mr. Cash’s blood type was AB, his wife had type A blood.

What would be the possible offspring blood types if Mrs. Cash was blood type AA?

Alleles:

Parental Genotypes:

Genotypic Ratios of offspring:

Phenotypic Ratios of offspring:

What would be the possible offspring blood types if Mrs. Cash was blood type AO?

Alleles:

Parental Genotypes:

Genotypic Ratios of offspring:

Phenotypic Ratios of offspring:

The man claiming to be the long lost son is blood type O. What is his genotype and could this man be Mr. Cash’s son?

4.  Hemophilia is an X-linked trait (found on the X chromosome) that is recessive.

Cross a normal male with a woman that has hemophilia.

Alleles =

Parental genotypes =

Offspring genotype(s) =

Offspring phenotype(s) =

5.  Mrs. Berger is color blind (sex- linked recessive trait). Her husband is not.

Show the cross between her daughter and a normal color vision male

(You know, in case the convent doesn’t work out!)

Alleles:

Parental Genotypes:

Genotypic Ratios of offspring:

Phenotypic Ratios of offspring:

6.  A bald man (sex- linked recessive trait) marries a woman whose father is bald.

What are the possible outcomes if they have children?

Alleles:

Parental Genotypes:

Genotypic Ratios of offspring:

Phenotypic Ratios of offspring:

8.  Long toes are dominant to short toes and a hairy back is dominant

to a nonhairy back. Cross a homozygous recessive for toes

and back with another that is heterozygous for both traits.

Alleles =

Parental genotypes =

Offspring genotype(s) =

Offspring phenotype(s) =