Mendel crossed a plant with round yellow seeds (RRYY) and a plant with wrinkled green seeds (rryy). What was the phenotype of all F1 offspring?

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MDCAT Biology QUESTION #4307

Question 1

Mendel crossed a plant with round yellow seeds ($RRYY$) and a plant with wrinkled green seeds ($rryy$). What was the phenotype of all F1 offspring?

All round green
All round yellow✔️
All wrinkled yellow
All wrinkled green

Correct Answer Explanation

All F1 offspring are $RrYy$. Since R (round) and Y (yellow) are dominant over r (wrinkled) and y (green), all F1 plants show the round yellow phenotype.

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