What is the expected genotypic ratio in the generation of a standard Mendelian monohybrid cross ()?
Answer and explanation
Correct answer: D.
- Step 1: A monohybrid cross between heterozygous tall garden peas involves gametes and with equal frequency ().
- Step 2: Combining gametes in a Punnett square yields , , and .
- Step 3: Therefore, the genotypic ratio of homozygous dominant to heterozygous to homozygous recessive is .
Answer
().
Why not the others: is the phenotypic ratio of dominant to recessive traits; is the test cross ratio resulting from ; is a dihybrid phenotypic ratio.
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