Homework Answers
Option D(4th option) is the correct answer.
Monohybrid cross is the cross involving two individuals that differ with respect to one pair of allele.
In incomplete dominance the phenotype of heterozygote will be intermediate to its parents.Here each incompletely domianant allele blocks the full expression of the other allele.
Example
Consider the trait flower color in snapdragons.Let R be the allele for red color and r for white color.Cross between red(RR) and white(rr) will produce Rr progenies(F1) having pink color.Here the pink color is due to incomplete dominance of two alleles.
Crossing two Rr individuals
Punnet square to find out F2 progenies
|
R |
r |
|
|
R |
RR |
Rr |
|
r |
Rr |
rr |
Monohybrid phenotypic ratio will be red:pink:white=1:2:1
Monohybrid genotypic ratio will be RR:Rr:rr=1:2:1
Therefore 3 phenotypes are red,pink and white.
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