In one family, all three children are homozygous for a recessive gene. What can be concluded about the parents?
A) Each parent is also homozygous for the recessive gene.
B) Each parent is heterozygous.
C) One parent is homozygous for the dominant gene; the other is homozygous for the recessive gene.
D) Each parent is either homozygous for the recessive gene or heterozygous.
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