Blonde hair comes from a combination of genes from both mom and dad, as it's a recessive trait, meaning you need two copies (one from each parent) for it to show, but it's more complex due to multiple genes and how they interact, so a child can get blonde hair even if parents have darker hair if both carry the recessive gene.
This means that both parents have to at least carry the gene for blond hair (for example) even if their own hair is brown or black. If both parents carry the gene, the kid has a greater chance of getting the different hair color. But if only one parent has the gene, then the dominant color will prevail.
Your biological father can pass on physical traits such as your biological sex, eye color, height, puberty timing, fat distribution, dimples, and even risk factors for certain health conditions.
Busting the Myth
Ultimately, hair loss isn't as simple as inheriting it from one side of the family. Instead, it's a blend of genetic influences that come from both parents.
Recent genome-wide surveys have shown that genetic variants linked to eight genes are significantly associated with blond hair color in Europeans2,6–8. Some human blond-associated variants alter the coding regions of known pigmentation genes1,9.
Yes. If they both have a recessive blonde gene they pass to the child. I have very dark hair and brown eyes. Both my kids are strawberry blonde with blue eyes.
Would you believe that only 2% of the world's population is naturally blonde? Crikey!
Fact: Although the inheritance from the mother's side is stronger, typical hair loss can be inherited from the mother's side of the family, the father's side or both.
Every cell we have descends from a the first human cell, a zygote. And zygote mitochondria comes only from egg cells, never from sperm cells. So every gene that belongs to us from mitochondria is only inherited from our mom's side. So, taking this into account, you could say that we have more mom genes than dad genes.
Asian hair generally exhibits the strongest mechanical properties, and its cross-sectional area is determined greatly by genetic variations, particularly from the ectodysplasin A receptor gene.
Fathers will always pass their X chromosome to their daughters and their Y chromosome to their sons.
Intelligence genes are situated on the mother's X chromosome. Thus, an intelligent mom has intelligent kids even if their fathers aren't wise. Scientists from the University of Cambridge conducted this study. The 'conditioned genes' behave differently depending on their origin.
Study shows paternal genetics dominate
And here are more fascinating facts about redheads: The reason red is the rarest hair color, according to Dr. Kaplan, is that, of the nine variants in the MC1R gene, only three are associated with the shade. “If a person has two of these three variants, they almost certainly have red hair,” she says.
The inheritance of eye color is more complex than originally suspected because multiple genes are involved. While a child's eye color can often be predicted by the eye colors of his or her parents and other relatives, genetic variations sometimes produce unexpected results.
If the copies are different to one another, then the dominant gene will determine the colour. We know that brown hair genes dominate over blonde, red and other hair colours.
Your biological father can pass on physical traits such as your biological sex, eye colour, height, puberty timing, fat distribution, dimples, and even risk factors for certain health conditions. Some of these, like Y-linked traits and the sex-determining chromosome, come exclusively from dad.
Superfecundation is the fertilization of two or more ova from the same menstrual cycle by sperm from the same or different males, whether through separate acts of intercourse or during a single sexual encounter with multiple males. This can potentially result in twin babies that have different biological fathers.
Fetal cells also pass through the membrane of the placenta and reach the womb during pregnancy. Male fetal cells have been found in women's blood up to 27 years after delivering a son. Thus, a lady may retain her baby's father's DNA for several decades following childbirth.
The reality is that maternal vs. paternal genes in hair traits isn't a black-and-white issue. Both parents contribute to your hair's fate, from baldness to texture to color. While the X chromosome does play a role in hair loss inheritance from mother or father, the genes inherited from dad shouldn't be ignored.
Your brother's unique DNA, being slightly different to yours, explains why brothers the world over can have totally different volumes of hair.
By the time you turn 30, you have a 25% chance of displaying some balding. By age 50, 50% of men have at least some noticeable hair loss. By age 60, about two-thirds are either bald or have a balding pattern.
Natural strawberry blonde hair is very rare, as it contains a red hue. Only 1-2% of people have the red hair gene globally, so others must use styling such as hair dye to achieve this shade.
The combination of blonde hair and blue eyes is rare. You need to inherit the genes from both of your parents. Most blondes have brown or hazel eyes. Blue eyes are more common in places like Northern Europe.
How to tell if a girl is naturally blonde? You can tell by checking if the blonde color is consistent from roots to ends, without visible regrowth or dye. Natural blondes may also have lighter eyebrows and lashes.