Assuming a typical monohybrid cross in which one allele is completely dominant to the other, what phenotypic ratio is expected if the F1's are crossed?

Assuming the dominant allele is represented as A, and the genotype as AA and the recessive as a, and genotype as aa; then the F1 will produce the offispring. Aa, Aa, Aa,Aa in ratio: 1:1:1:1:1

This shows the dominance of allele A.

However if two of the F1 generation are crossed then:

The F2 is AA,Aa,Aa,aa the phenotypic ratio is

3 ; 1

While the Genotypic ratio is ratio;

1AA : 2Aa Aa; 1aa(1 ;2;1)

Explanation:

PiaDeveau PiaDeveau · Answer 2 · 2022-04-13T03:23:27+02:00

The expected phenotypic ratio when the F1's (First generation) are crossed is 3:1 (Tall : dwarf)

Phenotypic and Genotypic ratio:

The expected genotypic ratio when the F1's are crossed is 1:2:1 in TT : Tt : tt (Tall : Tall : Dwarf)

We know that;

T = Tall (dominant)

t = Dwarf (recessive)

TT (tall) × tt (dwarf)

We get

Tt (tall) in F1 generation

So,

Tt × Tt

We get

TT (tall), Tt (tall), Tt (tall), tt (dwarf)

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