The phenotypic ratio in the F_{2} generation | vedclass

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(A) dihybrid cross involves two pairs of contrasting characters,for example,yellow round seeded plants and green wrinkled seeded plants (both pure lin

Vedclass · Accepted Answer

$9: 3: 3: 1$

Vedclass · Answer

(A) dihybrid cross involves two pairs of contrasting characters,for example,yellow round seeded plants and green wrinkled seeded plants (both pure lines,homozygous).When a dihybrid cross is performed between two pure-line homozygous parents,the $F_{1}$ generation shows hybrids with the dominant phenotypic effect.When $F_{1}$ heterozygous plants are self-fertilized to produce the $F_{2}$ generation,four types of phenotypic combinations are obtained.These combinations are: dominant-dominant,dominant-recessive,recessive-dominant,and recessive-recessive.The phenotypic dihybrid ratio of these four combinations in the $F_{2}$ generation is $9: 3: 3: 1$.In contrast,the genotypic dihybrid ratio is $1: 2: 2: 4: 1: 2: 1: 2: 1$.

The phenotypic ratio in the $F_{2}$ generation of a dihybrid cross is

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