Answer: The correct answer is -
The genotypic ratio of the offsprings of given parents is 100% Ee (Heterotrozygous dominant that exhibit unattached earlobes).
Explanation:
As per the given information in the question, unattached earlobe is a dominant trait over the attached earlobe, which is a recessive trait.
Dominant trait (expressed by capital letter allele like E for unattached earlobes) masks the expression of recessive trait (that is expressed by small letter allele such as e for attached earlobes).
Genotype of parents is-
EE (homozygous dominant) that will form 'E' and 'E' gametes.
ee (homozygous recessive) that will form 'e' and 'e' gametes.
When these parents are crossed, they will produce-
EE × ee
=Ee, Ee, Ee, Ee
Thus, all offspring are heterozygous dominant (Ee) that will exhibit unattached earlobe trait due to the presence of dominant allele (E) in them.