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gametogenesis in flowering plants - Coggle Diagram
gametogenesis in flowering plants
female gametes
produced in ovule
stigma style ovary ovule >> carpel
inside the ovulee
largee diploiddd, spore mother cell develops
cell then divide (meiosis) to produce 4 haploid cell
allllll but one cell degenerateddd, and the one surviving haploid cell develops > into EMBRYO SAC
the embryo sa. then growww largerre, and its haploid nuclues (hn) dividee (mitosis) 3 timessss forming > 8 haploid nucleii
one of these become female gamete (stayyy in ovuleee)
male gamete
produced by anther
inside anther
1 DIPLOID pollen mother (pm) cell (2n) divideeee (meiosis) form 4 haploiddd cell (n)
2 ONLY nucleiiiii (each 4 cell (haploid)) divideeeee (mitosisss) cytokinesis donot occur
the cells MATUREE into pollennnnn grainsssss
young pollen grainsss contain 2 haploidd nucleiii (n)
TWO nucleii in pollennnnn
generative nucleusss (male gamatesss)
tube nucleuss
anther filament >> stamen
diff of meiosis between animals and plants
gametes in plants are NOT formed directly by meiosis
meiosis is used to form pollen grain & embryo sac
gametes are then formed WITHIN pollen grain by mitotic divisionnn
gametes in animal ARE produced directly by meioticccc divisionnn
