It's not unusual. The parents would both be carrying genes for fair hair. Also it's quite common for brown haired people to be blond as children.
Although the genes passed down from a child's parents determine hair color, variations can result in a child having a different hair color than both parents. The genetics of hair color is the result of many genes working together to control the amount and type of melanin.
Blonde hair is a recessive gene so both parents just need to have blonde hair somewhere in their ancestory for the child to have a chance at being blonde. Both parents can have dark hair for several generations but if they ever had a blonde ancestor they carry the gene for it.
Absolutely, if both parents are heterozygous (BB). Black is dominant (B), while blonde is recessive (b). Therefore, if the child inherits the “b" allele from both parents, the blonde trait is now expressed, since there is no dominant gene to suppress it. The child's genotype is bb.
If both parents are brunette, they can only have a blonde child if they both carry the recessive blonde trait.
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. If two brunette parents have a blond child, they had to have instructions for making blond hair hidden in their DNA.
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.
Over the past 6 years, studies of genetic variation in thousands of people have linked at least eight DNA regions to blondness based on the fact that a certain DNA letter, or base, was found in people with that hair color but not in people with other hair colors.
A genetic mutation that codes for the blond hair of Northern Europeans has been identified. The single mutation was found in a long gene sequence called KIT ligand (KITLG) and is present in about one-third of Northern Europeans. People with these genes could have platinum blond, dirty blond or even dark 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.
True blonde is also a rare hair color, and the Daily Mail reports that only 12.7 percent of women have pure blonde hair, and only 9.9 percent of men do. Surprisingly, many of the genetic differences identified by the researchers correlated with factors other than pigmentation like hair texture and growth.
The genes for blue eyes and blonde hair are recessive, meaning both parents must have the genes for them to be expressed in their offspring.
Blond hair has also developed in other populations, although it is usually not as common, and can be found among natives of the Solomon Islands, Vanuatu and Fiji, among the Berbers of North Africa, and among some Asians.
If one parent is blonde and the other brunette, they might have a blonde child. This can only happen if the brunette parent carries the blonde allele. If he carries only brown alleles, he can only pass on brown alleles, and they'll dominate causing his child to have brown hair.
Generally speaking, paler, pinky skin tones suit cool, delicate blondes; think ash, beige or baby-blonde. 3. Darker or more yellow / golden-toned skins suit golden or honey hues; think butter, golden, caramel tones. 4.
It is also possible to have a blonde or brunette child if the redhead parent was carrying small amounts of eumelanin on a separate allele. If the redhead parent were auburn-haired or strawberry blonde, that possibility would increase.
Let's remember blonde hair is not owned by any one demographic or race. In fact, natural blonde hair can be found within Black communities. For instance, in Melanesia, a subregion of Oceania in the southwestern Pacific Ocean, blonde hair and dark skin is indigenous.
The reason has roots in evolutionary psychology. Both blonde hair and blue eyes are recessive traits, so both parents must carry the gene for blonde hair to pass it on to their kids. Some scientists think men with light hair and eyes are instinctively drawn to women with the same coloring.
One popular myth is that hair loss in men is passed down from the mother's side of the family while hair loss in women is passed down from the father's side; however, the truth is that the genes for hair loss and hair loss itself are actually passed down from both sides of the family.
Some sources, such as Eupedia, claim that in central parts of Norway, Sweden, Denmark, Iceland and Finland, 80% of the population is blonde, with natural fair-haired people in other Baltic Countries (Latvia, Lithuania, Estonia, and other parts of Scandinavia) making up 50-79% of the population.
Finland. Finland has the highest blond hair population by percentage of the total population. Nearly 80% of the population has blond hair, and an astounding 89% of the population has blue eyes. Blond hair and blue eyes are one of the rarest combinations in the world.
The exchange of this protein was the single determinant of the outcome of either blonde or dark hair. The gene is found only in Melanesian people, proving that their naturally occurring blonde hair is not an inherited European trait, but an outcome of random genetic mutation over time.
The international scientific team found a total of 124 genes that play a major role in determining human hair colour and, unexpectedly, discovered that women were twice as likely to be naturally blonde than men. In comparison, they also revealed that men were three times as likely as women to have black hair.
Red is the rarest hair color, according to Dr. Kaplan, and that's because so few MC1R variants are associated with the shade. “Only three variants are associated with red hair,” she says. “If a person has two of these three variants, they almost certainly have red hair.
Your baby's DNA comes in packages of alleles. These are either “dominant” or “recessive.” For hair color, the dominant alleles produce darker shades, whereas the recessive ones create lighter tones (4).