Is Blonde Hair A Recessive Or Dominant Trait

In the bbc article prof.

Is blonde hair a recessive or dominant trait. Blonde hair brown hair blue eye browns eyes none of those traits are dominant or recessive as they are not due to a single gene. Blonde hair bb is a recessive trait and brown hair bb is dominant. Which in a lot of ways is a good thing because multi gene traits allow for all of the wonderful variation we see around us.

Because our appearance is so strongly influenced by the color of our skin and hair geneticists have long sought to understand the genetic bases of these traits and when they evolved. Naturally most genetic differences between populations are not as superficial as eye and hair color and i m not aware that there are more recessive european specific alleles than you d expect by chance. If both parents have brown hair what must be true if one of.

A recessive gene recessive genes will not be expressed if they are masked by a dominant gene. We use the term heterozygous to describe the normal. G the term recessive was used by mendel to describe a physical trait that required a hereditary unit of each of two parents to appear although the two parents themselves did not show that trait.

Blond hair and blue eyes are the result of having less brown pigment melanin. The dominant alleles brown hair black hair brown eyes overthrow the recessive genes or metaphorically endanger them. In northern regions of europe evolution seems to have favored blond hair and bl.

Rather than one or the other hair color is additive meaning the pigment melanin along with a variety of genes determines how dark your hair will be. Well blond hair and blue eyes are caused by the absence of a pigment so it s not at all surprising that allele coding for the presence of one is dominant. Subsequently the study was attributed to the world health organization.

Blonde hair color is recessive but it can be passed on in the absence of a dominant trait. Jonathan rees of the university of edinburgh cast doubt on the story he was quoted as saying the frequency of blondes may. Some genes that reduce melanin overall cause people to have blond hair and blue eyes.