Question

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

Answer 1

Offspring   with  a  3:1  ratio  suggest  that  both  parent  that   both  parent  that   give  rise   to  this  offspring  were  both   heterozygous.  Heterozygous  individual   is   someone  who  has  two  different  allele  at  a  locus whereby  by  one  gene  is   dominant   over  the  other  gene.  example  of  heterozygous   parent   is  a parent  Aa   pair  of  alleles.  In  this  pair  gene  A  is  dominant  over  gene  a

Answer 2

Answer:

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.