# Question: 1 6marks in humans albinism is caused by a recessive...

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1. (6marks) In humans, albinism is caused by a recessive
allele (a) while normal pigmentation is caused by the dominant
allele (A).

a) If two pigmented parents have an albino child, what must
the genotypes of the parents be?

b) What is the probability that if they have another child,
that child will be albino?

c) What is the probability that the next two children are
albinos?

d) What is the probability that they have one albino and one
pigmented child? Be careful.

e) If these parents have dizygotic twins, what is the
probability that both twins will have the

same pigmentation? Again, be careful.