reproduction ✓

Question 1

what is fertilisation ?

Answer 1

involves the fusion of a male and female gamete to produce a zygote that undergoes cell division and develops into an embryo

Question 2

what is the role of oestrogen in the menstrual cycle ?

Answer 2

• produced in the ovaries
• causes the lining of the uterus to grow
• stimulates the release LH

Question 3

what is the role of progesterone in the menstrual cycle ?

Answer 3

• produced in ovaries by remains of follicle after ovulation
• maintains the singing of the uterus during the second half of the cycle when the level of progesterone falls the lining breaks down
• inhabits the release of LH and FSH

Question 4

what is the role of the placenta ?

Answer 4

• once embryo has been implanted the placenta develops

- lets blood of the embryo and the mother get very close to allow the exchange of food, oxygen and waste

Question 5

how is a developing embryo protected ?

Answer 5

• amnion membrane forms
• this surrounds the embryo and is full of amniotic feud
• amniotic fluid protects the embryo against knocks and bumps

Question 6

what is the role of oestrogen in the development of secondary sexual characteristics ?

Answer 6

trigger secondary sexual characteristics
girls:
- extra hard on underarms and pubic area
- hips to widen 
- breasts develop
- ovum release and start of periods

Question 7

what is the role of testosterone in the development of secondary sexual characteristics ?

Answer 7

trigger secondary sexual characteristics 
boys:
- extra hair on face and body 
- muscles to develop
- penis and testicles enlarge
- sperm production 
- deepening of voice

Question 8

what is genome ?

Answer 8

is the entire DNA of an organism

Question 9

what is a gene ?

Answer 9

a gene is a section of a molecule of DNA that codes for a specific protein

Question 10

what does the nucleus contain ?

Answer 10

chromosomes on which genes are located