Here’s how to determine the possible genotypes of the offspring from the cross RrYy x RRYy:
Set up Punnett Squares: Since we’re dealing with two traits (dihybrid cross), we’ll use a 4×4 Punnett square. We need to determine the possible gametes (sperm or egg cells) each parent can produce.
Parent 1 (RrYy): Can produce the gametes RY, Ry, rY, and ry.
Parent 2 (RRYy): Can produce the gametes RY, Ry, RY, and Ry (since there are two R alleles, only two unique gametes are possible).
Fill in the Punnett Square: Combine the gametes from each parent to fill in the cells of the square.
RY Ry rY ry
RY RRYY RRYy RrYY RrYy
Ry RRYy RRyy RrYy Rryy
RY RRYY RRYy RrYY RrYy
Ry RRYy RRyy RrYy Rryy
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Identify the Genotypes: Looking at the filled Punnett square, we can see the possible genotypes of the offspring:
RRYY: Appears 2 times
RRYy: Appears 4 times
RRyy: Appears 2 times
RrYY: Appears 2 times
RrYy: Appears 4 times
Rryy: Appears 2 times
Therefore, the possible genotypes of the offspring are RRYY, RRYy, RRyy, RrYY, RrYy, and Rryy. The numbers of times they appear indicate the probability of each genotype occurring.
What are the Possible Genotypes of the Offspring from the Following Cross: RrYy x RRYy?
Havilah Cason
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