One + one = three - Human fertilisation

6 important questions on One + one = three - Human fertilisation

For how many days can a sperm cell survive in a released egg?

5 days

What does a sperm cell do when it reaches the egg?

The sperm cell makes an opening in the membrane of the egg cell and the head of the sperm cell enters it.

When can you call it fertilisation?

When the nucleus of the sperm fuses with the nucleus of the egg.
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How do you call a fetilised egg?

A zygote

What are fraternal twins?

Twins that have developed from two seperate zygotes.

What are identical twins?

Twins that have developed from the same zygote, identical copies of eachother.

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