Answer;
-zygote is formed
Once an egg has been fertilized zygote is formed.
Step-by-step explanation;
-Fertilization is the fusion of two haploid gametes to produce a diploid zygote. Each haploid gamete in humans has 23 chromosomes, while the diploid zygote has 46.
-A fertilized egg is called a zygote until it divides into 16 cells, forming a ball-shaped structure called a morula. In humans, it takes about four days for a zygote to become a morula and another three days until the embryo attaches itself to the mother's uterine wall.