A genetic cross produces 48 offspring with the dominant phenotype and 52 with the recessive phenotype. If this trait is contolled by one gene with two alleles, what are the likely genotypes of the parents?.



Answer :

A 1:1 phenotypic ratio happens when there are simplest two phenotype possibilities as outcomes when organisms are crossed and they both have a 50/50 danger of performing.

Write the amount of homozygous dominant (AA) and heterozygous (Aa) squares as one phenotypic institution. be counted the quantity of homozygous recessive (aa) squares as every other organization. Write the result as a ratio of the 2 groups. A count number of 3 from one institution and 1 from the alternative might supply a ratio of three:

This means that 3 offspring could have a dominant phenotype. Then, there's one offspring so as to have a recessive genotype, and accordingly the recessive phenotype. consequently, the overall ratio of dominant to recessive phenotypes is 3:1.

There may be a 100% visibility rate within the unmarried dominant phenotype. As there may be no 2nd phenotype, there is no phenotypic ratio. If we did position this result as a ratio, it'd be four: zero.

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