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Gamete
Sexual Reproduction (animals)Gamete
Zygote
Fertilization (n + n 2n) Mitosis produces
subsequent somatic cells Meiosis
(2n n + n + n + n)Gametes
Meiosis I – homologous pairs separate
Synapsis Homologous
chromosomes form tetrads
Chiasmata may result
Paternal and maternal chromatids recombine (cross over)
Animal Sexual Life Cycle
MEIOSIS FERTILIZATION
n
n
n
2n2n
2n2n2n2n
2n 2n2n
2n2n2n
2n2n2n
2n2n2n
2n2n
2n2n
2n
MEIOSIS FERTILIZATION
nn
n
n
2n
n n n n nn
nnnnnn
nnnn n n nnnnn n
n n
Fungal/ProtistSexual Life Cycle