Answer:
The genotypic ratio shows the number of times a characteristic of an organism will be seen in the offspring when genes for certain traits are crossed. ... The genotypic ratio for this cross is written 1:2:1. In animals and plants, each gene has 2 alleles or variations, one from each parent.
For Example;
If the heterozygous yellow seeds Yy are crossed with heterozygous yellow seeds Yy,
Parents: Yy x Yy
Gametes: Y, y x Y, y
Offspring: YY, Yy, Yy and yy
YY (yellow), Yy (yellow), Yy (yellow) and yy (green)
From the Punnett square, the phenotypic ratio is 3 (yellow): 1 (green).
The genotypic ratio is 1: 2: 1 (YY- 1, Yy-2 and yy-1).
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