NEET BIOLOGY

Detailed explanation-1: -It is called partial dominance or semi dominance. Complete Answer: In Mirabilis jalapa, it shows incomplete dominance. If the red coloured plant (RR) is crossed with white coloured Mirabilis plant (rr), in the F1 generation, all plants make a hybrid plant (Rr) which is Pink in colour.

Detailed explanation-2: -In Mirabilis jalapa, there are two types of pure breeding plants, red flowered and white flowered. On crossing them the F1 plants or hybrids possess pink flowers. On selfing them, F2 generation has plants in the ratio of 1 red : 2 pink : 1 white flowered plants with phenotypic ratio being same as genotypic ratio.

Detailed explanation-3: -In Mirabilis jalapa, a red-flowered plant was crossed with a white-flowered plant, which resulted in all pink-flowered plants.

Detailed explanation-4: -In Mirabilis jalapa when homozygous red flowered and white flowered plants are crossed, all F1 plants have pink coloured flowers.

Detailed explanation-5: -Mirabilis jalapa (4 O’clock plant) shows incomplete dominance because the genes for red and white colour mix in F1 to form pink hybrids. Both the pure characters reappear in F2 generation.