An organism with a pair of indistinguishable genes is a

Explanation

This Biology question is asking about an organism with a pair of indistinguishable genes. The question is asking what this organism is called. The answer to this question is option D, homozygote. A homozygote is an organism that has two identical alleles for a particular gene. This means that both of the genes in the pair are the same. In contrast, a heterozygote has two different alleles for a particular gene, while a hybrid is the offspring of two different species or varieties. Allelomorph is an old term for allele, which is one of two or more versions of a gene. Diploid refers to an organism or cell that has two sets of chromosomes. Understanding the terms homozygote and heterozygote is essential in genetics, as they relate to inheritance patterns and the expression of traits. For more information on genetics and inheritance, please see the recommended textbooks.