Punnett Squares 7 & 8

#7- Human Eye color

• Blue eyes is recessive to brown eyes. Use the letter B.• Show the expected children

(genotypes and phenotypes) of a marriage between a blue-eyed woman and a brown-eyed man who had a blue-eyed mother.

Punnett Square #7

Parent Cross ______________________ X ________________________

Offspring genotypes:

Offspring phenotypes:

Punnett Square #8-Skin color

• In humans normal skin pigmentation is due to a dominant gene (A) and albinism is due to the recessive allele, (a).

• Show the work for the following cross and the genotypes for each person involved.–A normal man married an albino woman

and their first child is albino.

Punnett Square # 8Show the cross: _______________________ X ___________________________

Mother’s genotype:

Father’s genotype:

Child’s genotype: