Is it true that in the future everyone will have both brown eyes and brown hair?

Question

I heard that brown eyes and brown hair are caused by dominant genes and because of that EVERYONE in the future will have brown eyes and brown hair. Is this true? Why or why not?

Answer 1

No. A dominant allele does not become more frequent in a population under most circumstances. The inheritance of alleles in a population is explained by the Hardy-Weinberg equation and predicts that the frequency will remain constant, unless specific conditions occur (such as one allele being more advantageous than the other). See:
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/H/Hardy_Weinberg.html

Morganj has repeated a popular fallacy, that common alleles must be dominant and vv. Frequency has nothing to do the dominance or recessiveness: for example the O blood type is due to a recessive allele, yet is the commonest of the four types.

Answer 2

Brown eyes and brown hair are caused by dominant genes in some people and they are formed by recessive genes in others. People who have their brown eye colour formed by a pair of recessive gene can bring offspring of i.e. green eyes, if s/he get together with someone who have the dominant gene for green eye.
There is no way to get rid of other dominant genes i.e. dominant gene for green eyes and therefore No. Not everyone will be brown eyed.

Answer 3

Nope they wont...other racial traits, are inherited in exactly the same manner as brown hair and eyes do.
White skin, blue eyes, and other body features, do not dissapear, because they are also DOMINANT expressions (phenotype) of different genes....The theory you propose here, is the dissapearance of clearly inheritable genetic traits, and that will not happen...
Relax, mankind in the future will be richer, not poorer in physical attributes....Variety is the big difference (or equality, as you want to put it)....

Answer 4

Your 22, you are re-introduced to your old high school friend. After 3 1/2 years of dating, you dont hesitates when he purposes. You and your fiancé _Jeremy Paul_ are married on a _beach_. You honey moon in_Australia_ for _1 month_ After a year of true romance, you find your pregnant with a girl!! When she's born you instantly name her_Savannah Marie_. It just suits her thin blonde hair and brown eyes so well. When your daughter turns 3, you decide to move to_Florida_. and 3 months after your settled in you have a baby boy. He has brown hair after his Dad and dark green eyes. You name him_Jeremy Paul_. After another 5 years, both of your childrens personalitys start to shine. *Savannah* is very out going and makes friends with everyone she meets. She loves the violin and is a complete Girly girl. She adores her little brother and any other little kids. *Jeremy* is very shy and keeps to himself. Can be wild when with his Daddy though. After a while, *Jeremy* comes and tells you he would like a baby sister. You laugh at the thought. And 2 months later you are pregnant with a girl. When she is born she has green eyes and dark brown hair. You name her _Arabella Jeanne_. Your son and daughter love their new sister very much. Your 1st daughter takes 1st in her music competition. Your son starts_Football_ *a sport*. After a few years, your first daughter is in grade 11 and she falls for _James_ * boyfriends name*. they go out for a long long time. Your son joins a major sports league, and your 2nd daughter has recently just gotten a broken_wrist_*body part*. Once your first daughter graduates, your son moves to _California_ to persue a movie making career. His first film comes out entittled_Never_. Shortly after he marries and has twin boys named_James Michael_ & _Jeremy Paul III_. Your 2nd daughter graduates. That summer you host your 1st daughters wedding to her high school sweetheart. They move to_New York_. and she opens up a music academy. 2 months later she lerans she is pregnant with twins girls. She names them_Tekla Madelyn_&_Jamie Claire_ :)

Answer 5

nope when you have 2 genes, dominant and recessive, e.g. brown hair and blond hair in your genetic makeup, theres a 25% chance youl have blond hair, and a 75% chance youll have brown hair.

blond is however dominant over redhair.
and redhair is dominant over black hair.

on top of that the populations genepool is simply to large to rule out one characteristic.

what would keep blondes from having children with blondes?

Answer 6

Many of the answers so far were accurate (except the whole dominance thing - black hair is dominant over all. That's why most of the world has dark hair. Duh.) The most important aspect of this is that was in the days before colored contacts.

I have seen pale skinned children born to dark skinned parents. So variations will continue throughtmankinds existence. Ignore the propaganda of the White Supremacist web sites. As usual, they are way off base.

Answer 7

Jet black hair. I have actually dark brown hair and I believe dark hair looks better. I avoid really like blonde hair.

Answer 8

I dunno, but I highly doubt that "everyone" in the future will have brown eyes and hair. Caucasions are no longer the majority (they've been overtaken by hispanics, according to NBC), so maybe there's a chance, that atleast on the wetsern hemisphere, that the majority of ppl will have brown eyes and hair.

Answer 9

No, you are ignoring the importance of sexual selection. Blonde hair and blue eyes, while in the minority, are still considered attractive, and sought after in partners. Hence will remain in the population.

Answer 10

Following the "melting pot" sociological model, yes. Seven out of ten people are asian, so maybe black hair would be closer. If you take the endogamous social model, then there is less mixing and so lighter skin and eyes will persist longer.