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In a dihybrid cross Rr Yy x Rr Yy, how many different types of gametes can each parent produce (assuming independent assortment)?

Question
In a dihybrid cross Rr Yy x Rr Yy, how many different types of gametes can each parent produce (assuming independent assortment)?
One type
Two types
Four types (RY, Ry, rY, ry)
Eight types
Answer
Four types (RY, Ry, rY, ry)
Detailed Explanation
Each Rr Yy parent can produce four types of gametes: RY, Ry, rY, and ry, due to independent assortment of the two gene pairs.
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