Fact 1: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote.

Fact 2: Sperm and eggs are cells known as gametes.

Given the two facts above, answer the question "What occurs when gametes fuse to form a diploid zygote?" with the following options: 
- permineralization
 - rapid expansion
 - competition
 - fertilization
 - photosynthesis
 - chromosomes
 - mutation
 - Leptospirosis


 

    fertilization     