Round seeds are dominant to wrinkled seeds Rr x rr what percentage of the offsrpring will be round ?

Answer 1

For this, you are going to want to start out with a punnet square and fill in the results of the crossing

___r__ r
R Rr Rr
r rr rr

You should be able to figure out the percent of the offspring with round seeds (remember round seeds are dominant and only one dominant is needed (R) to give a dominant phenotype).

Answer 2

In this case Rr & rr are cross breeded so, we will obtain 50% of the offspring as round seeds.