The feminised marijuana seeds are feminised through several methods, including heat, chemical and radiation treatments, with a few exceptions. The male or female plant is usually called the flower.
The main method for getting a female flower involves a procedure known as stamen development, where a male flower is developed from flowers that have already been fertilised (the pistils). The result of this process is a female "petal" or floret with two sets of stamens (and the pistil), which are produced with the help of male pollen.
Flowering plants that are pollinated by both male and female pollen can be given a "mulled" appearance with the help of male pollen. These are commonly referred to as cross and self plants. The process of cross and self-pollination is the result of the pollen from the male parents and another plant, such as from an insect pollination event.
The female flowers often come in a variety of colors and shapes, in one of many possible combinations of gender. Most of these combinations are determined by the pollen or ovules received from one or more of the male parents.
To get a variety of plant genders, we usually have to combine several types of pollen/ovules. The pollen is collected from the father plants; the ovules are collected from the mother plants. The female plant is then started with a pollen.