Simulation · Biology · Class 12

Ploidy map of the fertilised ovule

From the lesson Double fertilisation in Sexual Reproduction in Flowering Plants. Change the values and watch what happens.

The idea behind it

NCERT §1.3

Inside the synergid the pollen tube releases its two male gametes into the synergid's cytoplasm.
One male gamete fuses with the egg nucleus: this is syngamy, and it gives a diploid zygote.
The other male gamete fuses with the two polar nuclei in the central cell, giving a triploid primary endosperm nucleus (PEN). Because three haploid nuclei fuse, this is called triple fusion.
Two fusions, syngamy and triple fusion, in one embryo sac make up double fertilisation, an event unique to flowering plants.
After triple fusion the central cell becomes the primary endosperm cell (PEC), which develops into the endosperm; the zygote develops into the embryo.

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