The crossing of pure line (inbred strain) individuals whose phenotype are opposite for the genetic trait “V” will give a progeny composed of:

A) 50% of V and 50% of v

B) 100% v

C) 75% of V and 25% of v

D) 100% of V

Hi everyone, the answer is D).

I understand that the parents must be VV x vv to give offspring Vv so 100% have the allele V.

But how can we conclude tha the parents must be VV and vv from the fact that they are pure line individuals?

Thank you for your help!