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Question
A normally pigmented couple has 4 children. one of their children is alnino and the remaining three are normally pigmented. what is the probability that their next child will be albino? give reasons
A normally pigmented couple has 4 children. one of their children is alnino and the remaining three are normally pigmented. what is the probability that their next child will be albino? give reasons
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Solution
- The probability that their next child will be albino is ¼ .
- One child of two normally pigmented parents has albinism, a recessive trait that results from a lack of the pigment melanin. The normal allele is A and the albino allele is a.
- Albinism appears with two recessive alleles. The genotype of the parents must be heterozygous with Aa allele. They may be the carriers of albinism.
- Both parents produce gene A and gene a. These fuse randomly and form three types of genotypes. AA, Aa, aa.This is 3:1 ratio. In practical terms it means, the probability of any of their subsequent children being an albino is ¼ , that is one chance in four.
- The probability that their next child will be albino is ¼ .
- One child of two normally pigmented parents has albinism, a recessive trait that results from a lack of the pigment melanin. The normal allele is A and the albino allele is a.
- Albinism appears with two recessive alleles. The genotype of the parents must be heterozygous with Aa allele. They may be the carriers of albinism.
- Both parents produce gene A and gene a. These fuse randomly and form three types of genotypes. AA, Aa, aa.This is 3:1 ratio. In practical terms it means, the probability of any of their subsequent children being an albino is ¼ , that is one chance in four.
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