The pollen tube releases two sperm nuclei into the ovule.

In flowering plants, the male gamete is produced inside the pollen grain through the division of a generative cell into two sperm nuclei.

During pollination, this generative cell divides and gives rise to two sperm nuclei.

It may grow a pollen tube and undergoing mitosis to produce two sperm nuclei.

In flowering plants, sperm nuclei are produced inside pollen.

Oomycetes form sperm nuclei in a syncytical antheridium surrounding the egg cells.

The sperm nuclei reach the eggs through fertilization tubes, similar to the pollen tube mechanism in plants.

This gene encodes a member of the H2B histone family that is specifically expressed in sperm nuclei.

The sperm nucleus then fuses with the ovum, enabling fusion of their genetic material.

Therefore, the necessity of the sperm nucleus for fertilization was discussed for quite some time.