Sexual spores are generated
from meiosis ploidy (number of
) reduction to a
compared to the mother cell.
Spores and give existence
gametophytes, individuals that
mitosis form gametes. meiosis that
generates spores is called
meiosis;it is, for , the type of
that occurs in .

Gametes are also with half the
of chromosomes of normal
cell of species, but they
specialized in fecundation, fusion
with another that generates the
, a cell with the number of
than gametic cells.
can appear from
meiosis or by gametophytes
originated from spores.

In humans well in most the
meiosisis gametic. are no spores
alternation of generations. male
gamete is sperm cell, and
female gamete is egg cell.