Men have the chromosomes pairing of XY and women have the pairing of XX.

- Both the egg and the spermatozoa have 23 chromosomes.  

- The egg is always the carrier of the X chromosome

- The spermatozoa can carry either an X or a Y chromosome.

This means that it is the male side that determines the sex of the baby.

A little point to make...

• Spermatozoa that carry the Y chromosome (required for a boy) get to the target very quickly, but they are less resistant.

• Spermatozoa that carry the X chromosome (required for a girl) are slower, but are much more resistant.

• (Question:  does this reflect in men & women in general?)

Therefore:

• If you have sexual intercourse a little before ovulation, you have higher chances of having a girl.

• If you have sexual intercourse at the same time as ovulation then you have higher chances of having a boy.

Introduction

1. The Feminine Cycle

2. The Man's Contribution

3. The Fertilisation

4. How A Girl Or Boy Is Created

5. Marking the Ovulation Time

6. Calculating The Due Date Of Birth

Annex.  Female Anatomy