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Transcript of RED HEADS
alleles would create was interesting to me, and knowing that people with red hair only make up 1-3% of the population is pretty cool!
HOW DOES THE GING HAPPEN?
Both copies of your
must be the red hair gene (
) for this all to work! The following possibilities can result in ginger babies:
13% of the population in Scotland is ginger, but 40% carry the gene.
The highest rate of red hair is from Ireland, ranking almost 30% of the population being ginger.
Red hair only makes up 1-3% of the human population.
Spain, Austria, Italy, etc. Only have 1% of a red hair occurrence because it's just not natural in their culture.
by Haylen Nordstrom
Thursday, December 18, 2014
Vol XCIII, No. 311
WHAT'S A GINGER?
FUN, FIERY FACTS ON US REDHEADS
THE STATISTIC PROBABILITY OF RED HAIR
Both parents are carriers
- both parents contribute to one of the two possible alleles (
). There is only a 25%
chance that their children will inherit two
alleles from both parents.
The mother is a redhead and the father is a carrier
- the child is guaranteed one
allele from the mother. There is a 50/50 chance for the child to inherit either an
allele from the father. Two
alleles result in red hair.
If both parents have red hair
- the children are guaranteed two
A punnet square showing the probability that the parents are both carriers
This gene can be passed on throughout your family for generations without you knowing
Caused by a series of mutations in the melanocortin 1 receptor (
This gene is located on chromosome 16
Both parents must carry this recessive gene to have red hair children
This terms travels all the way back to the 1500's, used to describe someone with fair skin, light eyes and freckles.
The colors of red hair range from copper to almost burgundy.
This is due to the high levels of the reddish pigment, pheomelanin, combining with the low levels of the dark pigment, eumelanin.
Most common around the Northern and Western fringes of Europe.
Red hair retains its color better than any other hair pigment, making us turn grey later than everyone else.
We are better at detecting temperature changes.
More efficient at making vitamin D, therefore we don't need as much sunlight.
Our hair is much thicker than anyone else.
More resistant to pain blockers.
The equation that we want is
r + r = rr (red hair)