Albinism is a recessive trait in humans. A normally pigmented man marries an albino woman.?

Question

They have 3 children, one of whom is an albino. What is the genotype of the father?

can somebody help me with this bio question b'c i have no idea!
thanks

Answer 1

the father is heterozygous. because albinism is recessive, an albino must carry two recessive alleles. the mother must pass a recessive allele because that's all she has to pass, while the father can pass either a dominant (normal) or recessive (albino) allele. we know the normal children must have one dominant allele (from the father), and the albino child must have two recessive alleles (one from the mother, one from the father), therefore the father is heterozygous.

Answer 2

I actually have albinism myself =) But to answer your question, both parents must carry the albinism gene for a baby to be born with albinism. Because the mother has albinism herself, she automatically passes the albinism gene to all three children, making them all carriers. The father has the albinism gene also but it was only passed to 1 of the 3 children making that child an albino.

Answer 3

Each child possesses one of the two genes the father possessess, and one of the two genes the mother possesses. Since mom is albino, both genes are albino. Since dad is normally pigmented, he may possess two normal genes, or one normal and one albino gene. For a child to have albino gene, must get an albino gene from dad (the child will get one from mom by default). Thus, dad has one albino and one normal gene.

Answer 4

the father is heterogenus meaning he is a carrier.
recessive requires two recessive genes and the albio woman will provide one recessive gene, and in order to have an albino child the father has to contribute a recessive gene. However the father is normal so he needs to have one normal gene, this would make him heterogenus.

Answer 5

The father is heterogeneous for the trait.

N = Normal pigment
n = albino pigment

Nn is the father.