Advertisements
Advertisements
Question
Give an account of incomplete dominance with a suitable example.
Solution
Incomplete dominance:
- Incomplete dominance is a deviation from Mendel’s law of dominance.
- In incomplete dominance, both the alleles (genes) of an allelomorphic pair express themselves partially.
- One allele (gene) cannot suppress the expression of the other allele (gene) completely.
- In such a case, there is an intermediate expression in the F1 hybrid.
- In Mirabilis jalapa, if a red-flowered (RR) plant is crossed with a white-flowered (rr) plant, then F1 offspring have pink (Rr) flowers.
F2 Generation: Selfing of F1
Result:
Genotypic ratio - 1 RR : 2 Rr : 1rr
Phenotypic ratio - 1 Red: 2 Pink :1 White
APPEARS IN
RELATED QUESTIONS
Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
Give appropriate biological/technical terms for the following:
A pair of corresponding chromosomes of the same size and shape, one from each parent.
State Mendel’s law of Dominance.
Define the following:
Heterozygous
Choose the correct answer:
If a pea plant with round seeds is selfed and the offspring are in the ratio 3:1, then the plant is _________
A plant with green pods and smooth seeds with the genotype Ggss will give rise to the following gametes:
Identify the percentage of recombinants in F2 generation in the following case.
In Morgan's experiment with Drosophila, the yellow-bodied white-eyed female was crossed with a brown-bodied red-eyed male and their F1 progeny were intercrossed.
If a cross between two individuals produces offspring with 50% dominant character (A) and 50% recessive character (a) then the Genotypes of parents are:
Give statement of the law of dominance.
