Although with the progress of society, people are no longer too paranoid about having a son or a daughter, there are still some parents-to-be who are looking forward to the arrival of their son before the baby is born. However, for families with certain genetic diseases, having a son may not be a good thing because these diseases can be passed on to the son, while having a girl will be healthier. There are some genetic diseases that are inherited in a companion fashion, which is often referred to as "male-to-female transmission". Some diseases that run in families are genetically linked to gender. For example, the following diseases.

Baldness

Nowadays, many middle-aged men in our society are experiencing the phenomenon of baldness, which makes men helpless. In fact, according to some studies, hair loss is also related to genetic inheritance. According to the theory of inheritance, if the father is bald, there is a 50% chance that the son will inherit the disease.

Hemophilia

Hemophilia is a condition in which the blood fails to clot due to the lack of factor VII, a blood clotting component in humans. This kind of patients will bleed more than once with a slight injury, even in the case of no trauma on the body surface, subcutaneous and intra-articular hemorrhage will occur. And it belongs to the typical chain of recessive inheritance, the causative gene is located in the X chromosome, usually carried by the mother of the causative gene, inherited to the son of the disease.

Fava bean disease

Fava bean disease is related to the eating of fava beans, which is an acute hemolytic anemia caused by eating fava beans, and is most common in children under 9 years old. Fava bean disease is more commonly inherited in couples where both partners are healthy but the mother carries a mutant chromosome, so boys born to the two will have a 50 percent chance of developing the disease, while girls are normal but half become carriers of the disease.

Red-green color blindness

Color blindness, a genetic condition that is passed on to males but not to females, is most common in red-green color blindness. The gene for color blindness in humans is found only on the X chromosome and not on the Y chromosome. In this case, the father's colorblindness gene is passed on to his daughter, and then through his daughter to his grandson. In other words, when the father is red-green colorblind, most of the daughters inherit it, while when the mother is a patient, the disease-causing gene is mostly inherited by the son.