Fertilisation

Question 1

Stages of fertilisation

Answer 1

1. Ovulation happens from the ovary into the oviduct
2. Egg travels down the oviduct moved by cilia
3. The egg and sperm nucleus join. This is fertilisation
4. They form a cell called the zygote
5. The zygote moves down the oviduct and into the uterus
6. The zygote embeds in the wall of the uterus. This is called implantation

Question 2

The day(s) in which the stages happen

Answer 2

Day 0: fertilisation ( fusion of sperm nucleus and egg in the oviduct)
Day 1: forms zygote (fertilisation only successful if the zygote successfully implants into the uterus lining )
Day 2: splits into 2 cells
Days 3-4: splits into 4 cells and 8 cells
Day 5: blastocyst
Day 8-9: implantation

Question 3

How are identical twins formed?

Answer 3

One egg is fertilised by one sperm and in later stages splits in 2 and they develop separately

Question 4

How are non-identical twins formed

Answer 4

When 2 eggs and 2 sperm come together and develop.

Question 5

What are the 2 types of reproduction

Answer 5

Asexual and sexual

Question 6

What is a zygote

Answer 6

The term use for a fertilised egg