A mutated MC1R gene causes what physical trait?
Melanocortin 1 receptor by α-MSH signaling through MC1R exclusively. In the United States, about 25% of the population carries the mutated melanocortin 1 receptor that causes red hair. With one in four people as carriers, the chance of two people having a child with red hair is about 2% (one in 64). The prevalence of red hair varies considerably worldwide. People with freckles and no red hair have an 85% chance of carrying the "MC1R" gene that is connected to red hair. People with no freckles and no red hair have an 18% chance of carrying the "MC1R" gene linked to red hair.
Flaxen gene silver. It does not affect chestnut (red) coloring. A genetic test exists for the silver gene. Flaxen gene The flaxen gene is a genetic mechanism that causes the mane and tail of chestnut-colored horses to be noticeably lighter than the body coat color, often a golden blonde shade. Certain horse breeds such as the Haflinger carry flaxen chestnut coloration as a breed trait. It is common in chestnut-colored animals of other horse breeds that may not be exclusively chestnut. Studies on Morgan horses have indicated that the flaxen trait is inherited, but the genetic mechanism that produces the trait is