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. E)All of these statements are true.

Question

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A testcross involves crossing an individual of unknown genotype with a homozygous recessive individual. The resulting offspring can help determine whether the unknown individual is homozygous dominant or heterozygous. Therefore, statement D is true. A is false as the physical appearance is the phenotype. B is false as alleles, genes, and loci all have distinct meanings. C is false as the phenotype of a dominant allele will be seen in the F₁ progeny of a monohybrid cross if the dominant allele is present. Therefore, E is also false.

Which of the Following Statements Is TRUE