A dominant allele, B, Causes blaze, a white forelock of hair in humans. The rece

Question

A dominant allele, B, Causes blaze, a white forelock of hair in humans. The recessive allele fr albinism, a, prevents the formation of melanin in any part of the body, so the hair is white all over. A man with a blaze had a albino mother. He marries an albino woman who had no blaze in either parent. Show the expected genotypic and phenotypic ratios of any children they may have. (Note: Because B is a rare allele, there is almost no chance that the man will have 2 of them). Show all Punnett Squares

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Explanation / Answer

A dominant allele, B, ---------------Causes blaze, a white forelock of hair

recessive alle –b --------------for albinism, -------- hair is white all over

A man with a blaze had a albino mother

Man genotype-----------Bb

Women albino---------------bb

Man genotype-----------Bb         x        Women albino---------------bb

B

b

b

Bb

blaze

bb

albino

b

Bb

blaze

Bb

albino

Ratio---------------- blaze(Bb): albino(bb)-1:1

B

b

b

Bb

blaze

bb

albino

b

Bb

blaze

Bb

albino

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