Fertilisation and Twins

Question 1

Name the 2 types of twins

Answer 1

Identical and non- identical

Question 2

What needs to happen for pregnancy to be successful

Answer 2

Pregnancy results if fertilisation is successful and the zygote successfully implants into the uterus lining

Question 3

How are identical twins produced

Answer 3

One egg, one sperm
Fertilised egg divides in two
Two parts develop separately
Babies have identical chromosomes and genes

Question 4

How are non- identical twins produced

Answer 4

Two eggs, two sperm

Question 5

Describe the journey of a sperm cell from the testis to the oviduct via sexual intercourse

Answer 5

Sperm cell travels down the sperm duct to the urethra, where the penis is then inserted into the vagina
Sperm then swim through a narrow entrance called the cervix to reach the uterus and then they can swim on to the oviduct to fertilise an egg