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## What is the probability that a cross between a heterozygous?

The possibilities are summarized: There is a 50% x 50% = **25%** probability that both of the offspring’s alleles are dominant. There is a 50% x 50% = 25% probability that both of the offspring’s alleles are recessive. There is a 50% x 50% + 50% x 50% = 25% + 25% = 50% probability that the offspring is heterozygous.

## What is ratio of heterozygous offspring?

The ratio of heterozygous offspring to the total offspring in the Punnett square is **4:4** (four to four). All four offspring have genotype Gg, in which there is one dominant G allele and one recessive g allele.

## What type of cross produces a 1 1 1 1 phenotypic ratio?

In the **monohybrid cross**, a testcross of a heterozygous individual resulted in a 1:1 ratio. With the dihybrid cross, you should expect a 1:1:1:1 ratio!

## How do you calculate the rate of heterozygosity?

Answer: Since q = 0.2, and p + q = 1, then p = 0.8 (80%). The frequency of heterozygous individuals. Answer: The frequency of heterozygous individuals is **equal to 2pq**. In this case, 2pq equals 0.32, which means that the frequency of individuals heterozygous for this gene is equal to 32% (i.e. 2 (0.8)(0.2) = 0.32).

## What is the phenotypic ratio of two heterozygous?

The expected genotype ratio when two heterozygotes are crossed is **1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive)**. When a phenotypic ratio of 2 : 1 is observed, there is probably a lethal allele.

## What is the Monohybrid ratio?

A monohybrid cross results in a phenotypic ratio of **3:1 (dominant to recessive)**, and a genotypic ratio of 1:2:1 (homozygous dominant to heterozygous to homozygous recessive). … By the 10th generation, only two hybrids would remain for every 1023 individuals of each homozygous class.