Which of the following is TRUE about alleles?
A) Individuals carry both forms of each allele.
B) Alleles come in two forms, the good form and the bad form.
C) An individual will only carry one version of an allele.
D) An allele is a variant form of a gene.
E) The phenotype of the individual will always indicate with certainty the alleles of the individual.
Answer: D
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Fill in the blank(s) with the appropriate word(s).