Asked by: Shaunna Celuna
asked in category: General Last Updated: 19th April, 2020

What is the genotypic and phenotypic ratio of Monohybrid test cross?

First cross
All the zygotes received one R allele (from the round seed parent) and one r allele (from the wrinkled seed parent). Because the R allele is dominant to the r allele, the phenotype of all the seeds was round. The phenotypic ratio in this case of Monohybrid cross is 1:1:1:1.

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Simply so, what is the phenotypic and genotypic ratio of a Monohybrid cross?

This is called 1:2:1 genotypic ratio of a monohybrid cross. However, phenotypically, the progeny shows 3 Tall and 1 Dwarf individuals (75% Dominant and 25% recessive characters) or 3:1 ratio. This is called monohybrid ratio or phenotypic ratio of a monohybrid cross.

are genotypic and phenotypic ratios the same? Since, in both the conditions heterozygous phenotype is different, the phenotypic ratio and the genotypic ratio are same for both the cases. So, we cannot say that if the phenotypic and genotypic ratio are same then it is incomplete dominance, it can also be co dominance.

Additionally, what will be the phenotypic and genotypic ratio of Dihybrid test cross?

Mendel's principle of independent assortment predicts that the alleles of the two genes will be independently distributed into gametes. 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 is Monohybrid test cross 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!

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