Answer:
the genotypes of both parent would have been heterozygous for the trait.
Explanation:
In the simple dominant or recessive pattern as described by Gregor Mendel in the year 1865 involving single gene inheritance. Illustrating this pattern using dark-skinned and fair-skinned people. Assuming dark-skinned to be dominant over fair skinned. the dark skinned parents if both are homozygous for dark skinned would not produce a fair-skinned child but if both are heterozygous for dark skinned, a fair skinned child can be produced. using D to indicte dark-skinned and d to indicate fair skinned, we have:
genotype DD x DD
F1 genotype DD
phenotype dark skinned
genotype Dd x Dd
F1 genotype DD Dd dd
phenotype dark skinned and fair-skinned