For a student to have inherited left handedness from parents who are both right handed, it means that the left-handed trait is recessive in both parents.
The pattern of inheritance of handedness can, thus, said to be simple dominant/recessive with the right handedness trait being dominant while the left handedness is recessive.
Let us assume that right-handedness is represented by the allele A and left-handedness by the allele a.
The two parents are heterozygous, hence, their genotypes each would be Aa.
Aa x Aa
AA Aa Aa aa
From the cross, 3/4 of their children would be right handed (AA or Aa) while 1/4 would be left handed (aa). The student in question must have been from the 1/4.
More about dominant/recessive traits can be found here: brainly.com/question/20744588
