1.1. A woman starts her first day of menstruation on the 7th of January.

Calculate when she is most likely to ovulate (assume a 28 day menstrual cycle).

1.2. Figure 1 shows descriptions of the four different stages of the menstrual cycle. 

Figure 1

Draw one line from each description to the correct stage.

1.3. Which gamete does testosterone play a role in the development of? 

1.4. Higher Tier Only

Figure 2 shows the blood hormone concentration of oestrogen and progesterone during a 28 day period.

It also shows the changes that occur in the uterus lining throughout that time.

Figure 2

What changes are associated with a decrease in the concentration of progesterone in the blood?