Redheads Need More Anesthesia than Others

Natural redheads need 20% more anesthesia than other people report scientists. "Redheads are likely to experience more pain from a given stimulus and therefore require more anesthesia to alleviate that pain." said Dr. Edwin Liem of the University of Louisville in Kentucky. Anesthesiology is still very much a mystery to scientists, and picking the right dosage that keeps someone out without killing them is still very much an art. Studies like this will help them determine how anesthesics work and why.

Comments

Re:About red hair

[msaavedra]

Your understanding of heredity is a little bit off. The examples you give are perfectly consistent with red hair being recessive, black hair dominant. Here's a simplification of how it works: imagine we have a gene with two alleles, let's call one 'R' for red, the other 'B' for black. Each person has two copies, so the redheaded parent has RR, the black-haired parent has BR. If you look at all the combinations the children could have, 1/2 would be BR (and have black hair), and 1/2 would be RR (and have red hair). For more information, draw a Punnett square, which should spell it out more clearly.

Note, however, that in real life, things are not quite that simple. Hair color is determined by the interaction of a number of genes. Thus, people don't have either pure black, pure blond, or pure red hair. There are many subtle variations.

Also, the other poster, troll or not, was completely wrong about redhead genes fading out because they are recessive. Genes do not change frequency within a population because they are recessive or dominant. If you read up on Hardy-Weinberg Equilibrium why this is true should be clear. Note that in very small populations (under say, 10,000), genetic drift and other random changes in the gene pool could wipe out some variants, but redheads number in the millions worldwide; their genes are not in danger of vanishing any time soon.