Final answer:
Traits related to fertilization, such as gonad types, are called primary sexual characteristics. Secondary sexual characteristics include features that distinguish sexes and help in mate attraction.
Step-by-step explanation:
Traits related to fertilization, such as types of gonads (testes in males and ovaries in females) or the structure of the ovary, are referred to as primary sexual characteristics. These are directly involved in sexual reproduction. In contrast, secondary sexual characteristics refer to features that are not directly involved in the reproductive process but distinguish the two sexes of a species and aid in mate attraction, such as the peacock's plumage or the development of facial hair in human males.
As for the ovary, during the process of oogenesis, the ovarian follicles develop from primary to secondary, and finally tertiary follicles, which is when a primary or secondary oocyte, multiple layers of granulosa cells, and a fully formed antrum are present before ovulation.