8.) 17 pts totall Two parents who have normal pigmentation (no albino trait have
ID: 209667 • Letter: 8
Question
8.) 17 pts totall Two parents who have normal pigmentation (no albino trait have two children: The first is albino and the second has normal pigment. a) 13 pts] What is the dominance relationship between the normal and albino allele? Give the genotypes of the parents and the first child mormal andl he ale are co-donínan 14 pts| What is the probability that the second child has the albino allel? The prohabiey that 4he secondl chilel has the albino allele is 50% or or) Z) 9,) 18 pts total] In melons, bitter fruit,(B is dominant over swet fruit (b). Yellow spots (E) are dominant over no spots (e). These genes assort independently a) 14 pts A homozygous plant with bitter fruit and spats is crossed with a homozygous plant with sweet fruit and no spots. The FI are crossed to produce the F2 . What arethe phenotypic ratiosjm the FA. 2 d2 non-spotted plant. Give the genosypes b) 14 ptsl An FI plant is crossedto a sweet. of the parents in this cross Also give the phenotypic ratios offspring e ratois 31Explanation / Answer
a). Albinism is an autosomal recessive condition. In the given case, it is given that the parents had normal pigmentation, but the first child is albino and the second child has normal pigment, means, both the parents are carriers of the recessive allele.
Assume that the gene coding for the normal protein is, “A” and the gene coding for albinism is, “a,” and A is dominant over a.
The genotypes of the parents (carriers) are, “Aa,” and that of the first child is, “aa.”
b). Cross between the patents (Aa) will result in progeny with the following genotypes and phenotypes.
Aa* Aa à AA (1/4 (or 25%), normal pigment), Aa (1/2 or 50%, normal pigment), aa (1/4 or 25%, albino)
Thus, the probability of the second child to have albino allele is, ¼ or 25%.
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