Question

in typical monohybrid cross the percentage of f2 resembling the f1 generation phenotypically is

Answer 1

Answer:

The classic ratio for a monohybrid cross with straight dominance is 3:1 Dominant to recessive in the F2. The classic ratio for a dihybrid cross with straight dominance is 9:3:3:1 in the F2. 1. A true breeding plant with yellow seeds (YY) is crossed to a plant with green seeds (genotype yy)

Answer 2

Answer:

In a typical monohybrid cross, the percentage of F₂ resembling the F₁ generation phenotypically is 75%.

Explanation:

To understand the answer properly, I am giving an example of a typical monohybrid cross and also explaining it.

• Mendel crossed the true breeding tall (TT) and dwarf (tt) pea plants and found that all the offspring in the F₁ (Filial₁) generation were tall. Then he self-pollinated the tall plants of the F₁ and found that short plants appeared in the second generation(F₂).
• Letters 'T' and 't' were used to represent the alleles of that gene, which determine the plant height. By convention, the uppercase letter represents the dominant allele, while the recessive allele represents the lowercase of the same letter. The tall plant is homozygous for the tall allele 'T' while the dwarf plant is homozygous for the dwarf allele 't'.
• The F₂ plants appear in a phenotypic ratio of 3:1, which means that 75% will be tall and 25% will be dwarf. While the genotypic ratio is 1:2:1, which means that 25% are the true-breeding dominant, 50% are the heterozygous dominant, and 25% are the true-breeding recessive progeny.

Hence, in a typical monohybrid cross, the percentage of F₂ resembling the F₁ generation phenotypically is 75%.