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A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The $F_1$ plants had yellow seeds and pink flowers. The $F_1$ plants were selfed to get $F_2$ progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the $F_2$ generation?
A
9
B
16
C
4
D
6
Detailed Solution
Seed colour (yellow dominant over green) follows simple dominance, giving 2 phenotypic categories in $F_2$ (3:1 ratio). Flower colour shows incomplete dominance ($F_1$ pink, an intermediate between red and white), giving 3 phenotypic categories in $F_2$ (1:2:1 ratio: red, pink, white). With independent assortment, total phenotypic categories $=2\times3=6$.