Question

9.7 in ratio of f2 generation represents ​

Answer 1

Answer:

The $f2$ second filial generation is the generation of individuals resulting from inbreeding between individuals of the $f1$ generation. Mendel allowed the $f1$-generation plants to self-pollinate to form the second generation, and he analyzed the seeds of the resulting $f2$ generation.

Explanation:

In $f2$ generation $9 : 7$ ratio is obtained in case of complementary genes.

• A dihybrid cross has a Mendelian ratio of $9 : 7$. Epistasis of dominance.
• One dominant allele at one location compensates for the absence of dominant alleles at another locus.
• A dihybrid cross has a $15:1$ ratio if it operates in both directions.
• Incomplete dominance occurs when two $f1$ hybrids are crossed, resulting in a genotypic and phenotypic ratio of $1:2:1$.
• Plants with at least one dominant allele of each of the two genes have the dominant phenotype; otherwise, they have the recessive phenotype. In the $f2$ generation, the observed ratio is $9 : 7$.

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Answer 2

Answer:

It represents the ratio of dihybrid cross in the F₂ generation.

Explanation:

To perform a dihybrid cross, Mendel did the following -

• He took 2 plants of the F₁ generation and let them self-pollinate, and then analyzed the resulting plants (in the F₂ generation).
• This ratio, as he observed is obtained in the case of complementary genes, with dominant epistasis.
• In this, one dominant allele at a locus compensates for the absence of dominant alleles at another locus.
• It has a 15:1 ratio, if it works in both directions.
• However, incomplete dominance occurs with 2 F₁ hybrids being crossed, resulting in a genotypic and phenotypic ratio of 1:2:1.
• Plants with at least one dominant allele of each of the two genes have the dominant phenotype; otherwise, they have the recessive phenotype. In the F₂ generation, the observed ratio is 9:7.
  
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