1. Lesson Starter How many eggs does the female release?
What is fertilisation?
Where in the body does fertilisation take place?
What is the zygote?

2. Reproduction in animals and plants Lesson 4

3. Development into a baby
Lesson 4
Development into a baby

4. After fertilisation
The egg and sperm FUSE in the FALLOPIAN TUBE during FERTILISATION
After fertilisation the cell continues to divide
The ball of cells IMPLANTS in the UTERUS

5. After fertilisation The ball of cells becomes an EMBRYO
Some of the cells form organs- the others form the PLACENTA

6. The placenta The baby gets everything it needs from its mother’s body
Placenta connects the baby and mum
Mother and baby’s blood comes into very CLOSE CONTACT but never mixes

7. The placenta
Nutrients and oxygen pass from the mothers blood to the baby
Waste products and carbon dioxide pass from baby to mother- mum gets rid of baby’s waste

8. The umbilical cord
The UMBILICAL CORD connects the baby to the PLACENTA
Contains large blood vessels that carry nutrients and oxygen to the baby and waste/co2 away from the baby

9. Complete the questions on page 9 of your reproduction booklets
Task
Complete the questions on page 9 of your reproduction booklets

10. Embryo development The cells continue to divide in the UTERUS
They form the organs and systems in the baby’s body
Early stages = embryo
8 weeks= foetus

11. 3 weeks The baby-in-the-making is a ball of cells called a BLASTOCYST.
The blastocyst contains a full set of DNA from mum and dad, which determines sex, eye colour, and other traits.

12. 6 weeks Ball of cells looks like a tadpole Has a head end and tail end
Heart begins to form

13. 8 weeks
Can now see eyes
Arms and legs have formed with tiny fingers and toes
Baby is called FETUS

14. 12 weeks Can kick its legs and move fingers
Internal organs are working

15. 18 weeks
Mum should feel baby moving from inside her tummy

16. 24 weeks Baby's taste buds are developing.
Brain is growing very quickly, and hair may be growing, too.
About a foot long and weighs just over a pound.

17. 32 weeks Baby has grown little fingernails and toenails.
Almost 17 inches long (head to heel) and weighs about 3 3/4 pounds.

18. 37-40 weeks Baby is now considered full-term.
Lungs should work fine if he's born now
Baby’s head is just above the cervix- when muscles in the mum’s uterus contract- the head will be born first