Page 442 - Primary Six Notes

Sex determination

Sex of a child is determined by chromosomes found on the

gametes /sex cells. There are X and Y chromosomes. XX chro-
mosomes are for girls and XY for boys.

Signs of Pregnancy

 Implantation bleeding. A very small amount of bleeding or

spotting that occurs shortly before the menstrual period. It

is less than a regular menstrual bleeding and comes earlier.

 Cramping in the lower abdomen.

 White milky vaginal discharge.

 Sickness, nausea and vomiting.

 Tiredness and fatigue.

 Positive blood pregnancy test.

 A missed menstrual period.