Thursday, February 9, 2012

What's the difference between 'incomplete dominance' and 'recombinant'?

in intermediate between the phenotype of individuals with homozygous for either allele. For ex. the cross between a red flower(C^R,C^R) and white flower (C^W,C^W), and the F^1 Generation is pick flower (C^R, C^W). The F^2 generation of breeding btw F^1 Generation shows that for every four (The ratio 1:2:1) There was one red flower, two pink, and one white. So, isn't this same as Recombinant (an off spring whose phenotype differs from that of the parents) Wtf!! That's the same as incomplete dominance! The the offspring (two pink flower) is different from either of their "parents" white, and red flower...So what IS the difference between these two?!
What's the difference between 'incomplete dominance' and 'recombinant'?
Incomplete dominance

In incomplete dominance (sometimes called partial dominance), a heterozygous genotype creates an intermediate phenotype. In this case, only one allele (usually the wild type) at the single locus is expressed, creating an intermediate phenotype. A cross of two intermediate phenotypes (= monohybrid heterozygotes)will result in the reappearance of both parent phenotypes and the intermediate phenotype.

The classic example of this is the colors of carnations.

R R'

R RR RR'

R' RR' R'R'

R is the allele for red pigment. R' is the allele for no pigment.

Thus, RR offspring make a lot of red pigment and appear red. R'R' offspring make no red pigment and appear white. RR' and R'R offspring make a little bit of red pigment and therefore appear pink.

Recombinant

The term recombinant DNA refers to a new combination of DNA molecules that are not found together naturally. Although processes such as crossing over technically produce recombinant DNA, the term is generally reserved for DNA produced by joining molecules derived from different biological sources.
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