It's a fairly common misconception that a man's beard is inherited directly from his father. The truth is that beards are just like most other genetically derived features: they can come from either side of the family. The unique feature of beards, obviously, is that they don't appear until maturity.
II. The beard is a case of sex limitation, dominant in the male, recessive in the female.
Most people who can grow a beard and moustache have a Y chromosome, which usually contains the genes that determine biological maleness. This can only be inherited from your father.
While the role of DNA is not yet fully understood, scientists have found that a marker in the LNX1 gene on chromosome 4 plays a role in facial hair growth. Specifically, variations in this gene seem to influence how thickly (or sparsely) your facial hair grows.
Genetics and hormones play a large role in determining how quickly and fully your beard will ultimately grow. Health and lifestyle habits can also play a part. Facial hair growth is largely propelled by testosterone, a hormone.
Ethnicity
People from Mediterranean countries tend to be able to grow thick beards compared to people from other regions. According to a 2016 study , Chinese men generally have less facial hair growth than Caucasian men.
Typically, full beard growth is possible starting at around age 18, but for many men, that time may not arrive until they're 30. So, if you're not getting the beard growth you want, it may be because it's not your time.
The results showed that beard length (directly measured and self-reported) was not related to testosterone levels or dominance; thus, no evidence was found to support the hypothesis that beards are honest (or dishonest) signals of the beard owners' testosterone levels and dominance.
Is Hair Color Inherited from Mother or Father? Hair color comes from both parents through the chromosomes passed onto their child. The 46 chromosomes (23 from each parent) have genes made up of DNA with instructions of what traits a child will inherit. The results can be surprising.
Low Testosterone Levels
Testosterone is a hormone that largely affects facial hair growth. Low level of this hormone means less chances of growing a beard.
One of our most inspirational female record holders is Harnaam Kaur (UK), who became the world's youngest female with a full beard at 24 years 282 days old. We had a chat with Harnaam to learn more about her life and how she does her amazing eyeliner!
Beard hair growth can mature well into a man's 30's so not having a beard at 21 is very possible. You can look at others in your family also to see if this is a common trait. It is well worth waiting for a few years before deciding whether you wish to do something.
If you can't wait that long, try growing your beard out for at least 2/3 months. Most people see poor growth after a week and give up. But even in just a few months, you will notice a big change to your facial hair. Gaps that were once there could start to fill in.
Genes from both parents are pooled, apart from the Y chromosome (male to male) and those genes in mitochondria (female to female). A man's beard and chest hair will depend on genes inherited from his mother as well as his father. The pattern may well resemble her father, or one of her brothers.
That's because of the follicles from which it grows. Hair follicles on the face are larger and flatter than those on the scalp, which produces hair that's thick and wiry. They also tend to be twisted in shape, which can make your facial hair curlier than your head hair.
If you aren't getting enough out of your diet, take some vitamins and other supplements to maintain good beard growth. While there are some "beard vitamins" on the market, a general daily men's vitamin will have what you need to grow a thicker beard. These include biotin, vitamins E, C and D, zinc, magnesium and more.
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.
Unlike nuclear DNA, which comes from both parents, mitochondrial DNA comes only from the mother.
The Truth About Dominant and Recessive Genes
For hair color, the theory goes: Each parent carries two alleles (gene variants) for hair color. Blonde hair is a recessive gene and brown hair is a dominant gene.
Contrary to popular belief, patchy beards are not usually the result of low testosterone levels. Rather, it mostly comes down to how sensitive your hair follicles are to dihydrotestosterone (DHT), a male sex hormone produced by testosterone.
Genetics also affect where facial hair grows and when your beard reaches its full potential. “From ages 18 to 30, most beards continue to develop in thickness and coarseness,” he says.
A mustache became a way to assert one's free past, but also to fit in. It became both a symbol of an older-school, tough-guy virility (see Burt Reynolds and Charles Bronson) as well as refined way to express new sensitivities and creative personas (Sonny Bono and Stan Lee).
Most men will have a full beard by their early 20s, but some may need to wait until they hit 30 to reach full beard growth. Puberty might initiate the facial hair growing process, but how fast and thick your beard grows will depend on factors that we'll discuss below, including genetics and hormone levels.