Which of the Following Statements Is TRUE

Multiple Choice

Which of the following statements is TRUE?

A) The genotype is the physical appearance of a trait.
B) Alleles, genes, and loci are different names for the same thing.
C) The phenotype of a dominant allele is never seen in the F₁ progeny of a monohybrid cross.
D) A testcross can be used to determine whether an individual is homozygous or heterozygous for a dominant allele.