What do you think would happen if multiple sperm fused with one egg?

Abortion

Explanation:

Normally, the oocytes have already developed different control mechanisms, which are activated when the sperm enters the menbrane of this. For example the depolarization of the menbrane, which prevents other sperm from entering.

In the hypothetical case that a second sperm enters the cell, eventually an abortion will occur. The reason behind this is chromosomal imbalance.

A typical mammal is 2n where each "n" means a set of chromosomes. When it is said to be 2n, it means that one comes from the mother, and another from the father. During cell division, homologous chromosomes are paired in groups of two and then separated. If a 2nd sperm entered, the individual would be 3n. This would be interpreted as a chromosomal error and the cell in question would initiate the apoptosis process (cell death). Eventually, an abortion would occur, since the embryo would not be viable.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.