When one gene control two or more different characters simultaneously, the phenomenon is called

1. The question describes a genetic phenomenon where a single gene controls two or more different, often seemingly unrelated, phenotypic characters. 2. This phenomenon is known as Pleiotropy (Option B). A classic example is the gene responsible for phenylketonuria (PKU), which causes mental retardation, reduced hair pigmentation, and skin pigmentation. 3. Apomixis (Option A) is a form of asexual reproduction that mimics sexual reproduction, producing seeds without fertilization. 4. Polyploidy (Option C) refers to the condition where an organism has more than two complete sets of chromosomes. 5. Polyteny (Option D, likely a typo for Polyteny) refers to giant chromosomes found in certain tissues of some organisms, formed by repeated DNA replication without cell division.