after seeing atleast 4 of your questions regarding punett square, i feel u should have a look at a good book.put D and D on the horizontal and d and d on the vertical lines. these are the gametes formed by the individuals. then write the genotypes in the boxes. in this case all 4 have Dd genotype.proceed in the same manner for the other cross ie by writing D and d on the horizontal and d and d on the vertical lines. the offsprings genotype can be expressed then. here, the ratio between Dd and dd is 1:1
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