Reproduction 3 (Fertilisation)

Question 1

What are the 5 things that need to happen to an egg before it develops into a foetus?

Answer 1

1. Ovulation
2. Copulation
3. Fertilisation
4. Cell Division
5. Implantation

Question 2

What is OVULATION?

When does it happen?

Answer 2

What is ovulation?
This is when an egg is released from an ovary

When does it happen?
Around day 14 of the menstrual cycle

Question 3

What is COPULATION?

Answer 3

This is when millions of sperm are released into the vagina from the penis during intercourse

Question 4

What is FERTILISATION?

Answer 4

This is when the NUCLEUS of the SPERM and EGG join together

Question 5

What is formed when the nucleus of the sperm and egg join together in fertilisation?

Answer 5

A Zygote

Question 6

When does cell division happen?

Answer 6

24 HOURS after FERTILISATION - the fertilised egg divides into 2

Question 7

How many cells have the fertilised egg divided into by 4 days after?

What is it called now?

Answer 7

32 Cells

It is called an embryo

Question 8

What is an embryo?

Answer 8

Ball of cells made from fertilised egg

Question 9

What is Implantation?

Answer 9

This is when the EMBRYO starts to implant itself into the WALL OF THE UTERUS and the PLACENTA begins to develop

Question 10

When does Implantation occur?

Answer 10

Around 1 week after fertilisation