Gregor Mendel is performing a two$-$factor $($dihybrid$)$ cross with pea plants. He first crosses a true$-$breeding plant with round, yellow $($RRYY$)$ seeds to a true$-$breeding plant with wrinkled, green seeds $($rryy$).$ He then crosses the F$1$ progeny: RrYy x RrYy$.$

How many different genotypes are expected in the resulting F$2$ progeny?

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How many different phenotypes are expected in the resulting F$2$ progeny?

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