describe how you could use genetic crosses to distinguish between co-dominance v
ID: 165533 • Letter: D
Question
describe how you could use genetic crosses to distinguish between co-dominance vs. dose effect.
Incomplete dominance (dose effect) or co-dominance ? In class we discussed that 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 (see slide below). 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 where using a tetraploid plant. In that case. AAAA=red. aaaa=whitc, 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. The best 5 submissions get an extra 5 points.Explanation / Answer
answer :lncomplete dominance:
===========================================
lncomplete dominance:
Since there are only 2 alleles & three phenotypes (red ,pink white)
The flowers of the plant can be---- red, pink, or white.
AA =RED ;
Aa=pink
and aa=WHITE
Colour is determined at a single locus.
The genotype AA--------- results in red flowers
and aa ----------results in white flowers
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Aa=pink --------- an intermediate phenotype in Fl but parental phenotypes reappear in F2.
Aa pink x Aa pink
A
a
A
AA =RED
Aa pink
a
Aa pink
aa=WHITE
this depicts that heterozygote--different from homozygotes-------lack of complete dominance .
intermediate phenotype : --------when compared to the homozygous dominant or homozygous recessive individuals,
this is said to be known as incomplete dominance.
A
a
A
AA =RED
Aa pink
a
Aa pink
aa=WHITE
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