The next one is Klinefelter's Syndrome, the probability of this one is 1 in 500-1000 males. The rarer forms are 1 in 50,000. There is a shortage in testosterone, leading to feminine features, incomplete puberty, reduced facial and body hair and infertility.
Lastly, we have Huntington's disease, this leads to a degeneration of nerve cells and occurs in the early 30s and 40s. The symptoms slowly begin to disappear though. Huntington's disease is an autosomal dominant disorder, which means that a person needs only one copy of the defective gene to develop the disorder.
Our next topic we will talk about will be Natural Selection, this is a process by which random evolutionary changes are selected for by nature in a consistent, orderly, non random way.
A misconception about Natural Selection is that people think survival of the fittest means being the strongest and fastest. While that is a factor, it really means the ability to live long enough to reproduce as many offspring as you can to keep the generation going.
There are four conditions for Natural Selection There must be a variation in the population, Not all individuals survive to reproduce, Survival is not random, the survivors have an advantageous trait that helps them survive. And the advantageous trait must be inheritable.
Some stuff like having bright colors and being good at difficult things will help you mate. Anyways I hope you guys are prepared for the test the is coming up tomorrow. At least try to study, that means all of you.