After a cross between two corn plants,the F₁ plants all had a dwarfed phenotype.The F₂ consisted of 1,207 dwarf plants and 401 tall plants.Identify the phenotypes and genotypes of the two parents. A) DD (dwarf),dd (tall) B) DD (tall),dd (dwarf) C) dd (dwarf),dd (tall) D) DD (dwarf),DD (tall) E) dd (dwarf),Dd (tall)

Question

Quizplus · Accepted Answer

The F₁ plants all had a dwarfed phenotype, which means that the dwarf allele (d) is dominant over the tall allele (D). The F₂ consisted of 1,207 dwarf plants and 401 tall plants, which is a 3:1 ratio. This ratio is consistent with the expected ratio for a cross between two heterozygous parents (Dd). Therefore, the genotypes of the two parents must be Dd (dwarf) and dd (tall).

After a Cross Between Two Corn Plants,the F1 Plants All

After a Cross Between Two Corn Plants,the F₁ Plants All