Dihybrid Crosses. Crosses that involve 2 traits 4 x 4 Punnett Square (16 total boxes) 2 traits in peas: R = RoundY = Yellow r = Wrinkledy = Green.

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Dihybrid Crosses

Crosses that involve 2 traits 4 x 4 Punnett Square (16 total boxes) 2 traits in peas: R = RoundY = Yellow r = Wrinkledy = Green

How to Solve First determine the genotypes of the parents: –Heterozygous: RrYy x RrYy –This will usually be given to you in the problem. Determine the combinations of the gametes. Label the top and side of the Punnett Square and fill in all boxes.

Determine Gamete Combinations RrYy x RrYy What are the possible combinations that the parents will pass on to the offspring –RY –Ry –rY –ry

RRYYRRYyRrYYRrYy RRYyRRyyRrYyRryy RrYYRrYyrrYYrrYy RrYyRryyrrYyrryy RY Ry rY ry RY Ry rY ry Offspring Ratio: 9:3:3:1 9 round, yellow 3 round, green 3 wrinkled, yellow 1 wrinkled, green