It turns out that brown hair is dominant. That means that even if only one of your two alleles is for brown hair, your hair will be brown. The blond allele is recessive, and gets covered up.
The best-studied hair-color gene in humans is called MC1R. This gene provides instructions for making a protein called the melanocortin 1 receptor, which is involved in the pathway that produces melanin. The melanocortin 1 receptor controls which type of melanin is produced by melanocytes.
Curly hair is considered a “dominant” gene trait. Straight hair is considered “recessive.” To put that in simple terms, that means that if one parent gives you a curly-haired gene and the other parent gives you a straight-haired gene, you'll be born with curly hair.
It turns out that brown hair DNA is stronger than the other colors. You only need one brown allele to have brown hair. It is a dominant trait. The DNA for blonde or red hair is not as strong as brown.
Every hair color contains some amount of the darker pigment eumelanin. Low levels of eumelanin result in lighter hair, and higher levels result in darker hair. The genes responsible for hair color are neither dominant nor recessive — it is a matter of which genes are turned on or turned off.
Black hair is the darkest and most common of all human hair colors globally, due to larger populations with this dominant trait. It is a dominant genetic trait, and it is found in people of all backgrounds and ethnicities. Black hair contains a large amount of eumelanin pigmentation, a type of melanin.
And it is true: the hereditary factor is more dominant on the mother's side. If your dad has a full head of hair but your mom's brother is a 5 on the Norwood Scale at age 35, chances are you will follow your uncle's journey through MPB. However, the gene for MPB is actually passed down from both sides of the family.
The one that takes precedent is the dominant gene. Red hair is a recessive gene, so your husband has two red hair genes. The only way for your child to have red hair is if you have a recessive red gene (being covered by the dominant brown hair gene) and that is the gene that gets passed onto the baby.
Redheads probably won't go grey. That's because the pigment just fades over time. So they will probably go blonde and even white, but not grey.
Research has shown that people with red hair perceive pain differently than others. They may be more sensitive to certain types of pain and can require higher doses of some pain-killing medications. However, studies suggest that their general pain tolerance may be higher.
If two brunette parents both have a recessive blonde gene, there's a 25% chance they'll each pass down their recessive gene, resulting in a blonde child.
The story of human migration and evolution is written in hair DNA. In sub-Saharan Africa, genes favour tight, curly hair. But in east Asia, mutations have led to straighter, thicker hair. In Europe, other mutations brought wavy and straw-coloured hair.
The genetics of height
If they are tall or short, then your own height is said to end up somewhere based on the average heights between your two parents. Genes aren't the sole predictor of a person's height. In some instances, a child might be much taller than their parents and other relatives.
Black hair are dominant over brown hair.
So all in all the answer to your question is neither! Blonde hair, brown hair, blue eyes, browns eyes … none of those traits are dominant or recessive, as they are not due to a single gene.
Recessive traits like red hair can skip generations because they can hide out in a carrier behind a dominant trait. The recessive trait needs another carrier and a bit of luck to be seen. This means that it can sometimes take a few generations to finally make its presence known.
And the statistics bear that stereotype out. Ireland has the highest per capita percentage of redheads in the world -- anywhere from 10 to 30 percent, according to Eupedia, a website that explores European genetics and ancestry. They are almost equally prevalent in Scotland and other pockets of Celtic pride.
gingerphobia (uncountable) (UK, informal) Fear, dislike, or hatred of people with red hair.
Red hair (also known as orange hair and ginger hair) is a hair color found in one to two percent of the human population, appearing with greater frequency (two to six percent) among people of Northern or Northwestern European ancestry and lesser frequency in other populations.
Red hair is the result of a genetic variant that causes the body's skin cells and hair cells to produce more of one particular type of melanin and less of another. Most redheads have a gene mutation in the melanocortin 1 receptor (MC1R).
They have a higher pain threshold
A McGill University study found that redheads could handle more electric shocks than those with different coloured hair. Other research discovered that gingers are better at handling stabbing or sharp pain.
Both parents must possess the gene for a red-haired child to be born. Redheads have fewer strands of hair on their heads. If they both just have the gene but have brown hair lets say then there is a 1 in 4 chance of having a baby with red hair.
All men inherit a Y chromosome from their father, which means all traits that are only found on the Y chromosome come from dad, not mom. The Supporting Evidence: Y-linked traits follow a clear paternal lineage.
Hair thickness is an “additive" trait. This means that if you inherited two copies of the “thick hair" version of the gene (one from each parent), you'll likely have even thicker hair strands than if you only inherited the "thick hair" version from one parent.
Each parent will pass one copy of their eye color gene to their child. In this case, the mom will always pass B and the dad will always pass b. This means all of their kids will be Bb and have brown eyes. Each child will show the mom's dominant trait.