Question

Genotype of male plant is $S_2{S}_3$ while of female plant is $S_1{S}_2$ .Which of the following pollen grain is compatible for the stigma of given female plant

• A. $S_1$
• B. $S_2$
• C. $S_3$
• D. $S_1,S_3$

Answer 1

Answer: (C)

$S_3$

This process is called as self-incompatibility, here if the pollen grain and the female plant has the same genotype then the pollen will not germinate. They will only germinate if the pollen grains and female plant have different genotypes. Sins in the question it is said that genotype of the pollen grain is S${}_2$S${}_3$ while p\female plant has S${}_1$S${}_2$, so the pollens having the genotype S${}_2$ will not germinate as it is similar to female plant while pollen of genotype S${}_3$ will generate as it is different from the female plant.

So, the correct option is 'S${}_3$'.