fertilisation

Question 1

what is the 1st step of fertilisation

Answer 1

The sperm head meets the protective jelly layer around the egg cell called the zona pellucida and the acrosome reaction occurs-enzymes digest the zona pellucida

Question 2

what is the acrosome reaction

Answer 2

The head of the sperm cell releases enzymes that digest a path through the protective outer layer of the egg cell (the zona pellucida)

Question 3

what is the 2nd step of fertilisation

Answer 3

The sperm head fuses with the egg cell membrane thus allowing the sperm nucleus to enter the egg cell

Question 4

what is the 3rd step of fertilisation

Answer 4

The cortical reaction occurs which causes the zona pellucida to harden and prevents polyspermy

Question 5

what is the last step of fertilisation

Answer 5

The nuclei fuse and a full set of chromosomes is restored, thus forming a diploid zygote