(a) In the fruit fly Drosophila the allele for full wing is dominant to the alle

Question

(a) In the fruit fly Drosophila the allele for full wing is dominant to the allele for vestigial wing. One parent was homozygous in respect of full wing and the other parent was heterozygous. What is the % chance of obtaining offspring with full wing?
(b) In roses there is incomplete dominance between the allele governing red petals and the allele governing white petals. Heterozygous individuals have pink petals. A plant with pink petals was crossed with a plant with white petals. What is the % chance of obtaining offspring with white petals?
(c) In Dalmatian dogs the allele for brown spots is recessive to the allele for black spots. The two parents were heterozygous in respect of spot colour. What is the % chance of obtaining offspring with black spots?
(d) Red hair in humans is recessive to all other hair colours. A red-haired woman and a black-haired man, whose own father was red-haired, started a family. What is the % chance of obtaining offspring with red hair?

Explanation / Answer

(a) 100%
(b) 50%
(c) 75%
(d) 50%

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