The reproductive cells of crops are called gametes. Gametes are specialized cells that combine during fertilization to form a zygote, which ultimately develops into a new plant. In crops, the male gametes are produced in the anthers of the flower, while the female gametes are produced in the ovules. Gametes contain half the genetic material of a normal cell, and when they combine during fertilization, they form a zygote with a complete set of genetic material. This process allows for genetic diversity and variation in crop populations.