In some cases it can be difficult to distinguish between co-dominance and incomp

Question

In some cases it can be difficult to distinguish between co-dominance and incomplete dominance using genetic crosses. Our discussion in class referred to a diploid species where flower color was coded by a single locus where AA=red, aa=white and Aa=pink. The pink color could be caused by only a half of red pigment in heterozygotes (dose effect), or because the presence of red and white pigment gives pink (co-dominance). Things would get much easier if, instead of a diploid plant, we were using a tetraploid plant. In that case, AAAA=red, aaaa=white, AAaa=pink. In 200 words or fewer, describe how you could use genetic crosses to distinguish between co-dominance vs. dose effect. In the case of co-dominance, assume that the amount of pigment produced by an allele is independent from the number of alleles present.

Explanation / Answer

Codominance produce phenotypes that are intermediate between or combinations of those produced by homozygous dominant or homozygous recessive individuals.Punnett squares helpful in inheritance of single genes.Punnett squares show the genotypes of each parent as well as the genotypes of potential offspring. Phenotypic and genotypic ratios of offspring can be predicted from the data in Punnett squares.

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