35. The following is a cross between two individuals with the genotypes as indicated for four...

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Biology

35. The following is a cross between two individuals with thegenotypes as indicated for four unlinked autosomal genes.

Aa Bb Cc dd X aa BB Cc Dd

1. For each gene, assume the capital letter indicates a dominantallele and the lower case letter (small) indicates a recessiveallele. What proportion of the progeny would have the followingoverall phenotype: recessive phenotype for A, dominant phenotypefor B, dominant phenotype for C, and recessive phenotype for D?

2. Now assume that, unlike part 1, the two alleles of gene Bshow incomplete dominance and that the two alleles of gene C alsoshow incomplete dominance. Like in part 1, for the alleles of genesA and D the capital letter is dominant and the lower case (small)letter is recessive. In this situation, what would be theproportion of the progeny with the following overall phenotype:recessive phenotype for A, dominant phenotype for B, dominantphenotype for C, and recessive phenotype for D?

3. Explain the differences between the terms dominant,incompletely dominant, and co-dominant.

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Parental genotypes Aa Bb Cc dd X aa BB Cc Dd 1 Desired pheotype recessive phenotype for A ie aa dominant phenotype for B ie BB or Bb dominant phenotype for C ie CC or Cc and recessive phenotype for D ie dd Now from the cross between parental A gene ie Aa X aa Constructing the Punnett square Gametes A a a Aa aa a Aa aa From the cross the chance of getting aa genotype ie the recessive phenotype is 2412 Similarly from the cross between parental B gene ie Bb X BB Constructing the Punnett square From the cross the chance of getting BB Bb genotype ie the dominant phenotype is 441 Similarly from the cross between parental C gene ie Cc X Cc Constructing the    See Answer
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