Across
- 4. The ovule turns into this when it is fertilised
- 8. What happens on day 1 of the menstrual cycle
- 11. Variation can be caused by genes and the ______________
- 12. The addictive substance in cigarettes
- 13. How much detail you can see with a microscope
- 14. A ring of muscle that is at the entrance to the uterus
- 15. How much bigger you make something with a microscope
- 18. Alcohol is an example of this type of drug
- 19. The part of a plant where pollen is deposited
Down
- 1. What happens to the uterus lining during day 5-14 of the menstrual cycle
- 2. a gas that diffuses from the baby to the mother
- 3. A short length of DNA that codes for a particular trait
- 5. sac Protects the baby when it is in the uterus
- 6. The part of a plant that produces pollen
- 7. The place where sperm is made
- 9. Happens on day 14 of the menstrual cycle
- 10. When the egg and sperm fuse
- 16. A structure in the nucleus that is made of DNA
- 17. The part of the baby that carries out exchange between mother and baby