(D) An organism is said to be $Homozygous$ for a trait when it carries two identical alleles for that specific gene (e.g., $TT$ or $tt$).In contrast,

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(D) An organism is said to be $Homozygous$ for a trait when it carries two identical alleles for that specific gene (e.g., $TT$ or $tt$).In contrast, an organism is $Heterozygous$ if it carries two different alleles for a gene (e.g., $Tt$).Therefore, the correct term for an organism with two identical alleles is $Homozygous$.