# When two hybrids AaBb and AaBb are crossed the phenotypic ratio of offspring will be?

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1 : 2 : 1.

## What is the phenotypic ratio obtained when AaBb is crossed with AaBb?

A Punnet Square for the AaBb x AaBb cross is shown below. Rather than the 9:3:3:1 seqregation of phenotypes normally seen with an AaBb x AaBb dihybrid cross, the phenotypic ratio is 9:3:4.

1 : 2 : 1.

## How many genotypes will be produced in the cross AaBb AaBb?

There are four possible combinations of gametes for the AaBb parent. Half of the gametes get a dominant A and a dominant B allele; the other half of the gametes get a recessive a and a recessive b allele. Both parents produce 25% each of AB, Ab, aB, and ab.

1:1:1:1.

## How do you find the phenotypic ratio?

Write the amount of homozygous dominant (AA) and heterozygous (Aa) squares as one phenotypic group. Count the amount of homozygous recessive (aa) squares as another group. Write the result as a ratio of the two groups. A count of 3 from one group and 1 from the other would give a ratio of 3:1.

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## What is the phenotypic ratio of dihybrid cross?

This 9:3:3:1 phenotypic ratio is the classic Mendelian ratio for a dihybrid cross in which the alleles of two different genes assort independently into gametes.

## What will be the genotype of F1 upon crossing AaBb and AaBb?

In the dihybrid cross, the two parental genotypes are AABB and aabb. The genotype of all F1​ plants is AaBb.

1 : 2 : 1.

## What is the ratio of phenotypes found in a Monohybrid cross for the f1 generation?

Mendel showed the classic 3:1 phenotypic ratio of a monohybrid cross (one trait present in two forms, or alleles), although the terms ‘phenotype’ (an individual’s appearance) and ‘genotype’ (the gene variants present) were not yet in use.