Reproductive Cells

Function: To carry the female DNA and nourish the developing embryo in the early stages.

Features:

Contains nutrients in cytoplasm to feed embryo.

After fertilisation egg's membrane changes structure so no more sperm can get in.

Contains haploid nucleus.

Function: To transport male DNA to female's egg so they can combine.

Features:

Small.

Long tail.

Lots of mitochondria in middle section to provide energy (respiration) to move to egg.

Acrosome at front, enzymes stored here to digest way through membrane of egg cell.

Contains haploid nucleus.

Stage 1 - (Day 1) Bleeding. Uterus lining breaks down (Menstruation)

Stage 2 - (Day 4 to 14) Lining of uterus builds up. Thick spongy layer of blood vessels.

Stage 3 -  (Day 14) Egg released from ovary (Ovulation)

Stage 4 - Lining maintained (For about 14 days until day 28) If not fertilised, menstruation happens again.