Two plants are crossed, resulting in offspring with a 3: 1 ratio for a particular trait. this ratio suggests that

This questiin lacks options, the options are:

A) that the parents were true-breeding for contrasting traits.B) incomplete dominance.C) that a blending of traits has occurred.D) that the parents were both heterozygous.E) that each offspring has the same alleles

The answer is A

Explanation:

This question illustrates the F2 generation of most F1 offsprings who obtained a 3:1 phenotypic ratio. The 3:1 means three of the dominant and one of the recessive trait. The dominant trait can either be homozygous or heterozygous while the recessive trait will only be expressed in a homozygous state.

Hence, based on Mendel's observation, Mendel performed a cross that resulted into 3:1 when he crossed two heterozygous offsprings i.e. combination of both of ALLELES. In a nutshell, this 3:1 ratio suggest that the parents are both heterozygous.