Refer to the figure, which shows alternation of generations in the life cycle of a land plant. 
At which step in the diagram are gametes being formed?
Definitions:
Chorionic Villi Sampling
A prenatal test involving the sampling of chorionic villi from the placenta to detect genetic abnormalities.
Gestational Age
The age of an embryo or fetus calculated from the first day of the pregnant woman's last menstrual period.
Postmature
A term referring to a fetus or newborn that has gone beyond the typical gestation period, usually more than 42 weeks, which may pose risks for the child.
Premature
Occurring before the usual or expected time.
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