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If you cross RrYy and RRyy pea plants, what fraction of the offspring will have round yellow peas? R=round, r= wrinkled, Y =yellow, y=green Multiple Choice 0% 100% 50% 75% 25%

User Shuduo
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2 Answers

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Final answer:

When crossing RrYy and RRyy pea plants, 50% of the offspring will have round yellow peas due to the dominance of the round allele (R) and the inheritance of the Y allele from one parent.

Step-by-step explanation:

If you cross a RrYy (round yellow) pea plant with an RRyy (round green) pea plant, the fraction of the offspring that will have round yellow peas can be determined using a Punnett square. In this cross, R is dominant to r (where R=round and r=wrinkled) and Y is dominant to y (where Y=yellow and y=green). All offspring will receive at least one R allele for round peas from the RRyy parent and at least one r allele from the RrYy parent. Since round (R) is dominant, all offspring will have round peas. However, the offspring's pea color is dependent on the combination of Y and y alleles they inherit.

To determine the color of the peas, we must look at the alleles for color in the parents: the RrYy parent can contribute either a Y (yellow) or y (green) allele, and the RRyy parent can only contribute y (green). Using a Punnett square, you would have two boxes with Y (from RrYy) and two with y (from RrYy), all crossed with yy (from RRyy). This means that 50% of the offspring will have the genotype Rryy (round green peas) and 50% will have the genotype RrYy (round yellow peas).

Therefore, the fraction of the offspring that will have round yellow peas is 50%.

User Dan Mantyla
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8.0k points
5 votes

Answer: THE TRUE ANSWER IS 100%.

Explanation: Tiavien is WRONG. People keep making these long-winded responses just for them to be wrong and mess ppl up.

User Ti
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9.4k points
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