Mendel Genetics?

Question

Mendel crossed a wild-type (round, yellow peas) pea plant to a pure breeding wrinkled green pea plant. He got 55 round yellow, 51 round green, 49 wrinkled yellow and 53 wrinkled green. What was the genotype of the two parents. Use your own nomenclature.

Answer 1

R=round
r=wrinkled
Y=yellow
y=green
The parents had to be RrYy and rryy because the ratios are 1:1:1:1 and that's the only possible way to get those numbers.
You'd end up with equal numbers of this:
RrYy (round, yellow)
rrYy (wrinkled, yellow)
Rryy (round, green)
rryy (wrinkled, green)