Question

ratio of possible progeny when Rr is crossed withrr

Answer 1

The answer is (C)
105 Round :: 99 Wrinkled

When Rr is crossed with rr
(1) Rr will produce 50% Gametes carrying R and 50% Gametes carrying R allele..
(2) rr plants will produce all Gametes carrying r alleles

So progenies produced by cross of Rr wit rr plants will be
50% Rr (Round) and
50% rr (Wrinkled seed)

Hope it helps..
Thanks