In a plant species the genotypes of AB produce red flowers A

In a plant species, the genotypes of A_B_ produce red flowers, A_bb produce orange flowers and both aabb and aaB_ produce white flowers. An individual red flowered plant was crossed with an individual orange flowered plant, to produce 3/4 red to 1/4 white flowered plants. 31. The genotype of the crossed individual orange plant was: a) AAbb b) Aabb 32. The genotype of the crossed individual red plant was: a) AABB b) AABb c) AaBB d) AaBb

Solution

31. b) Aabb

32. d) AaBb

Cross between Aabb (orange) and AbBb (red) yields three red plants and one white plant.

Aabb x AaBB

Red colour plant imparts colour only when A is present with B otherwise it will give orange colour and in absence of dominant A allele plant will show white colour. So in the above example AABb, AaBb will give red colour and aaBb will give white colour. It is an example of co-dominance.

	Ab	ab
AB	AABb	AaBb
aB	AaBb	aaBb