Hereditary law of color weakness in three generations

Color weakness refers to a decrease in the ability to recognize colors. It is a color vision disorder caused by congenital or acquired factors. Most congenital color weakness is inherited by x chromosome recessive, most common is red and green color blindness, more males than females. If male color weakness patients, the disease gene located on the x chromosome is transmitted to their daughters. The daughter's single x chromosome has the disease gene and does not develop the disease, but the gene is transmitted to the next generation of males. A man who has a single X chromosome with the disease gene will develop the disease, which is also called cross inheritance. This is also known as the saying that the grandfather will pass the disease on to his grandson. In the case of female color deficiency patients, a single X chromosome with the disease gene will not develop the disease. only the mother will carry the disease gene and pass the X chromosome with the color deficiency gene to the daughter. Meanwhile, the father has color deficiency, and the daughter will acquire two X chromosomes with color deficiency genes.