Question

In snapdragon, when a red flower plant is crossed with a white flower ones. The resultant hybrid plant have pink coloured flower if plant of F, generation is crossed with a white flower ones, the progeny will be. (A) 10% Red. (B) The Red flower & White flower ratio in 3:1 (C) The pink flower & White flower ratio in 1:1 (D) The pink, Red and White flower ratio in 1:2:1​

Answer 1

Answer:

Correct option is A)

Explanation:

A. When F1 hybrid exhibit a mixture or blending of characters of two parents, it is called incomplete dominance. For example, in snapdragon one parent is homozygous for red flowers (AA) and the other is homozygous for white flowers (aa). No dominance is present and the heterozygous F1 flowers are pink. The 1: 2: 1 ratio of red, pink and white flowers in the F2 progeny is shown by appropriate colouring.

B. In codominance, both alleles of a pair express themselves fully in F1 hybrid. For example, in cattles when a cattle with red coat is crossed with the cattle having white coat, the F1 hybrid possess roan appearance. In roan appearance, the red and white hairs occur in patches but no hairs have intermediate colour of red and white.