After fertilisation in an angiosperm ovule:
Endosperm (3n):
Formed by triple fusion (fusion of one male gamete with two polar nuclei in the central cell).
Hence, triploid ( ).
Zygote (2n):
Formed by syngamy-fusion of egg cell male gamete .
Hence, diploid ( ).
Degenerating antipodals (n):
Antipodals are haploid (n) as they arise from the female gametophyte (embryo sac).
They degenerate after fertilisation.

──────────────────────────────────────────────────────────────────────────────────────────