Question

How is a zygote formed in humans?

Answer 1

Zygote is the first result formed after fusion of male and female gametes i.e. sperms and egg respectively .

Fertilization in humans complete in 3 steps :

1. Acrosomal reaction
2. Cortical reaction
3. Amphimixis

Acrosomal & cortical reactions include the breaking of membranes of egg by the sperm for its entry .

Amphimixis stage include Zygote formation .
Male & female nucleus fuse to form Synkaryon or Zygote .

Gametes are haploid in nature i.e only set of chromosomes are present . Fusion makes the combination of both chromosomes makes the zygote diploid . Further growth of zygote to human body has a diploid nature only .