Question

In a monohybrid cross what will be percentage of heterozygous offspring in F4 – generation - (1)25%(2)50%(3)12.5%(4)6.25%

Answer 1

as we know in F2 gen - 2 Rr , RR and rr plants are formed
therefore for F3 we have to cross RR X Rr,    Rr X Rr,   Rr X rr,   RR X rr
we will get 3RR , 3rr and 10Rr plants 

for F4 gen will have the same ratio result hence 10/16 X100 = 6.25%