Question

Gene families are groups of _______ genes that arose by _______ and _______. homologous; gene duplication; sequence evolution homologous; speciation; sequence evolution homologous; gene duplication; genetic drift heterologous; gene duplication; sequence evolution heterologous; speciation; genetic drift

Answer 1

"Gene families are groups of homologous genes that arose by gene duplication and sequence evolution."

Gene families are groups of various similar genes that are originated mostly by duplication, but also by evolution and relocation. These genes are distributed into families taking into account shared nucleotide or protein sequences.