The genotypic and phenotypic ratio of the F1 generation resulting from a cross of two grasshoppers, both with red and yellow stripes is (1:2:1) 25% red, 50% red and yellow, and 25% yellow.
From the question, we know that red stripes are expressed from the homozygous RR genotype, yellow stripes from the homozygous YY genotype, and both from the heterozygous genotype.
The cross can be represented as shown in the figure.
Hence the phenotypic ratio is:
Red striped: 1
Red and Yellow striped: 2
Yellow striped: 1
So, the correct answer is 1:2:1.
For more information about the genotypic and phenotypic ratio refer to the link:
https://brainly.com/question/14935121
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