Albinism is inherited as an autosomal recessive. Parents who are normal have a c

Question

Albinism is inherited as an autosomal recessive. Parents who are normal have a child with albinism. What is the probability their next child will be normal? a) 1.0 (100%) b) 0.25 (25%) c) 0.75 (75%) d) 0.00 (0%) e) 0.0625 (6.25%) In the F2 generation of a cross, a ratio of 1:2:1 would be indicative of which type of inheritance? a) codominance - 2 genes b) Independent assortment - 3 genes c) incomplete dominance - 1 gene d) epistasis - 2 genes e) epistasis - 3 genes The following two questions refer to the pedigree shown below. Individuals expressing a rare disease are indicated by the solid symbols. Please see the for the pedigree. Is the trait illustrated in the pedigree: a) dominant b) recessive c) partially dominant Is the trait illustrated in the pedigree: a) X-linked b) autosomal

Explanation / Answer

Question 5

Albinism -------recessive trait-geneotype-aa

Parents –normal –heterozygous –Aa

heterozygous –Aa x heterozygous –Aa

A

a

A

Normal homozygous –AA

Normal heterozygous –Aa

a

Normal heterozygous –Aa

Affected -aa

Answer =3/4= 0.75 (75%)

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Question 6

F2 generation of cross , a ratio of 1:2:1

Answer

Incomplete dominance -1gene

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Question 7

answer

a) Recessive

a) x-linked

one x-linked Recessive allele is enough for expression male

two x-linked Recessive allele are required for expression female

A

a

A

Normal homozygous –AA

Normal heterozygous –Aa

a

Normal heterozygous –Aa

Affected -aa

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