How many kinds of human gender are there?

People's gender can be divided into six types at different levels. According to different perspectives, gender can be divided into six different levels, namely: gene gender, chromosome gender, gonad gender, genital gender, psychological gender and social gender.

At the genetic level, SRY gene is generally considered as a sex-determining gene, that is, with SRY gene, it will develop into a boy, and without SRY gene, it will develop into a girl.

It is found that SRY is only one of many genes that affect gender development, and more than ten genes related to gender development have been found, which regulate the development of fetal sexual characteristics from different developmental stages. Problems at any stage will cause abnormal sexual development, which will make children show vague sexual characteristics after birth.

Extended data:

Sex in plants (plants) is the same as that in animals, and plants also have gender differences, that is, there are specialized male and female organs and even strict male and female individuals.

Understanding of Plant Sex In ancient China, there was an understanding of the gender of higher plants. For example, Erya (about 2200 years ago), written from the Spring and Autumn Period to the early Western Han Dynasty, recorded that "mulberry petals have mulberries and gardenias", which means that half of mulberry trees can bear mulberries called gardenias.

More than 65,438+0,400 years ago, the relationship between male hemp pollen and female hemp seed setting was correctly understood in Qi Shu and the cultivation of hemp in the Northern Wei Dynasty. "If you release the male, you will pull it out. If you don't release the male, you won't bear fruit" (releasing the male flower means releasing pollen). China's understanding of plant sex is earlier than that of Europeans 1000.

The female and male organs of most angiosperms, namely the female perilla and the male pistil, are embedded in the same flower. This kind of plant is called hermaphrodite, which is represented by symbols; In some plants, the pistils and stamens are inserted in different flowers, which become unisexual female flowers and male flowers, but the female flowers and male flowers are born on the same plant at the same time. This kind of plants are monoecious plants, and the symbol is ♂♀, such as corn and melon.

Baidu Encyclopedia-Gender