<P> Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct sexual haploid and asexual diploid stages . In these groups, a multicellular gametophyte, which is haploid with n chromosomes, alternates with a multicellular sporophyte, which is diploid with 2n chromosomes, made up of n pairs . A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n . </P> <P> The haploid spores germinate and grow into a haploid gametophyte . At maturity, the gametophyte produces gametes by mitosis, which does not alter the number of chromosomes . Two gametes (originating from different organisms of the same species or from the same organism) fuse to produce a zygote, which develops into a diploid sporophyte . This cycle, from gametophyte to gametophyte (or equally from sporophyte to sporophyte), is the way in which all land plants and many algae undergo sexual reproduction . </P>

Vascular plants exhibit alternation of generation. what is alternation of generation
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