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## How many phenotypes are in a Trihybrid cross?

27:9:9:9:3:3:3:1 ratio: As can be seen in the forked line diagram above, a trihybrid cross yields a phenotypic ratio of 27:9:9:9:3:3:3:1. This reflects the phenotypes generated by the 64 genotypic combinations resulting from 8 different male gametes fertilizing 8 different female gametes.

## Is it possible to have a Trihybrid cross?

A trihybrid cross involves the same steps as a dihybrid cross, but instead of looking at the inheritance pattern of two specific traits, it is **possible to look at three different traits** and the probability of their combination showing up in the genotype.

## What is Trihybrid cross with example?

trihybrid, tetrahybrid, etc. are all crosses in which three, four, etc. number of hybrid traits are monitored in a cross between two organisms that are heterozygous for each trait in question. e.g.: **AaBbCc x AaBbCc (trihybrid)**; AaBbCcDd x AaBbCcDc (tetrahybrid), and so on.

## What would be the sum of phenotypes and genotypes obtained from a Trihybrid test cross?

The sum of phenotypes and genotypes obtained from a trihybrid test cross: As a “dihybrid cross”, the phenotypic ratio is 9:3:3:1. … Therefore, the total number of phenotypes and genotypes produced in a “dihybrid cross” are **4 + 9 = 13**. The phenotype ratio concluded for dihybrid cross is “9:3:3:1”.

## 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.