Q.In which mode of reproduction variations are seen ?

Sexual reproduction is built around the fusion of a male gamete and a female gamete to form a diploid zygote, which develops into a wholly new organism; because two different parental genomes combine in this fusion, sexual reproduction - unlike the single-parent asexual strategies - is the source of the genetic variation that evolution and adaptation depend on. Animals show two broad forms of sexual reproduction: syngamy, more commonly called fertilization, in which two haploid gametes fuse directly into a diploid zygote, and conjugation, a temporary union between two individuals in which nuclear material is exchanged without any gametes fusing outright. Syngamy itself takes several distinct forms depending on where the gametes come from and how alike they are (autogamy, exogamy, hologamy, paedogamy, merogamy, isogamy and anisogamy), and is further cl …