In a monohybrid Mendelian cross between two heterozygous tall pea plants (), what is the expected phenotypic ratio of tall to dwarf offspring?
Answer and explanation
Correct answer: C.
- Step 1: Set up Punnett square for : Genotypes are .
- Step 2: Because the tall allele () is completely dominant over dwarf (), both and produce the tall phenotype (total 3).
- Step 3: Only produces dwarf (total 1).
- Step 4: The phenotypic ratio is .
Answer
3 : 1.
Why not the others: '' results from a test cross (); '' is the genotypic ratio (); '' is the phenotypic ratio of a dihybrid cross.
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