Diets & Weight Loss

Albinism

An inherited disorder in which there is no pigmentation in skin, hair or eyes, due to the absence of melanin, the substance that gives skin its color.

Question: Albinism...............? Albinism (lack of skin pigmentation) is caused by a recessive autosomal allele. A man and a woman, both normally pigmented, have an albino child together. The couple decides to have a second child. What is the probability that the second child will be albino? a. 0% b. 25% c. 50% d. 75% e. 100%

Answer: (b). The parents are heterozygous. The Punnett square is Nn x Nn: _____N____n___ N___NN___Nn__ n___Nn____nn___← this child is albino EVERY child has a 25% of being an albino.

 


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