Traditional Culture Encyclopedia - Photography major - What is color blindness?
What is color blindness?
Etiology of color blindness
It is generally believed that red-green color blindness is determined by two pairs of genes on the X chromosome, namely the red-blind gene and the green-blind gene. Because these two pairs of genes are closely connected on the X chromosome, they are often represented by a gene symbol. The genetic mode of red-green color blindness is X-linked recessive inheritance. Men only have one X chromosome, so they only need one color blindness gene to show color blindness. Women have two X chromosomes, so they need a pair of pathogenic alleles to behave abnormally. If a normal woman marries a color-blind man, the father's color-blind gene can be passed on to their daughter through the X chromosome, but not to their son. Daughters pass color blindness genes from father to son, which is called cross inheritance.
Extended data:
Common color blindness
I. color blindness
It belongs to complete cone cell dysfunction, which is just the opposite of night blindness (rod cell dysfunction). Patients especially like darkness and photophobia, showing day blindness. The colorful world is gloomy in its eyes, just like watching black and white TV, only light and shade, no color difference. Moreover, red is dark and blue is bright. In addition, there are symptoms such as poor eyesight, amblyopia, central scotoma and oscillatory nystagmus. It is one of the most serious color vision disorders, which is rare for patients.
Second, red and green color blindness
The inability to distinguish between red and green is a congenital color vision disorder.
The cause of red-green color blindness is that the gene controlling red-green color blindness is located on the X chromosome and is a recessive gene, usually expressed by Xb. Because the Y chromosome is too short and lacks homologous fragments corresponding to the X chromosome, there is no gene to control color blindness. The genetic mode of red-green color blindness is cross-inheritance.
People's network-suffering from color blindness? It's not just genes at work.
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