specific qs - fertilisation

• Whats the process after a zygote moves down fallopian tube (what type of cell division)?


  Mitosis - and it forms an embryo
• whats the number of chromosomes found in the fertilised female gamet?


  It is double
• What is the unfertilised gamete known as (number wise)


  haploid
• • List the characteristics of insect pollinated flowers

  • They have large and bright coloured petals to attract insects whilst wind pollinated plants have small and dull petals
  • insect pollinated plants have nectar which attracts insects
  • Insect pollinated plants DO NOT have a feathery stigma
• Describe the events that lead to seed formation 


  The pollen would land on the stigma and then grow a tube called a pollen tube which goes down the style and into the ovule. The pollens nucleus would then travel down the pollen tube and fuse with the ovum’s nucleus. Then the ovary would be the fruit and the ovule would be the seed.
• What is a hormone?


  A chemical messenger which travels through blood and is secreted by glands
• describe oestrogen In menstrual cycle:


  oestrogen which is produced in the ovaries maintains the lining of the uterus which allows the fertilised egg (zygote) to implant in the lining. it also thickens the lining of the uterus in which also STOPS the release of FSH
• what does FSH do in the menstrual cycle?


  FSH helps with the maturing of an egg during ovulation. FSH is produced in the pituitary gland.
• What does LH do in menstrual cycle?


  LH is the release of an egg also known as ovulation. the egg is realised through the fallopian tube ready to be fertilised.
• Describe how changes in the lining shown (in diagram) adapt it for its function if an egg IS fertilised

  The thickness of the lining would increade. The zygote would undergo mitosis to become an embryo. and the embryo then can implant more blood vessels into the lining for the placenta
• What evidence is there that changes in the concentration of the hormone , may be connected with changes in body temperature 


  As when the concentration of blood decreases and increases the temp slowly follows
• What happens to oestrogen, FSH and LH during Menstruation 


  During menstruation: oestrogen , FSH and LH are very low as the uterus lining is breaking down so there is no need for it to be maintained or for the egg to mature.