Allergies. Allergies can cause a runny nose, sneezing, itching, or coughing. Food allergies are the most common in babies, but pets and insects can also cause an allergic reaction. Learn about baby allergies and how to ease them. 1  Facebook. 2  Pinterest.
But redheads as a group have more in common than only their hair color -- certain health conditions appear to be more common among people with red hair. Here are five health risks linked with being a redhead. About 1 to 2 percent of the human population has red hair.Redheads have genes to thank for their tresses. Research shows red hair usually results from a mutation in a gene called MC1R, which codes for the melanocortin-1 receptor. The pigment found in redhair that makes it red is called pheomelanin.ut redheads as a group have more in common than only their hair color -- certain health conditions appear to be more common among people with red hair. Here are five health risks linked with being a redhead. About 1 to 2 percent of the human population has red hair. Redheads have genes to thank for their tresses.
It's a sex linked mutation and occurs only on the X chromosome. Males are much more likely to be color blind than females, because it is linked only to the x chromosome. Males only have one x chromosome and females have two.For females to have the colorblind mutation, their father has to be colorblind and their mother has to be a carrier or colorblind.ed-green color blindness is a sex-linked trait. The receptors of red and green color are found on the X chromosome; therefore, men are more likely to be red-green color blind â¦ since they only have one.