Genes will always mutate, and some of those mutations will be advantageous. Among them are height, head circumference in infants, and hip size in females—crucial for giving birth to those infants. In evolutionary terms, this means that some people are born without this trait, and they do just fine. In other words, the population is evolving. If a mutation keeps you from successfully reproducing, it follows that such a genetic change would have difficulty gaining a foothold in the larger population.
By Sara Chodosh posted Sep 7th, at It's also possible that something called the grandmother hypothesis , which says that living long enough to help take care of your grandchildren makes them more likely to survive, and therefore makes your own genes more likely to be passed on, is involved. Tall men in the Netherlands have more children than their short buddies, so they tend to produce more tall men, who go on to have generally tall babies. Because alleles carry neighboring DNA with them as they circulate, the number of singletons on nearby DNA can be used as a rough molecular clock, indicating how quickly that allele has changed in frequency. Our genome has been evolving too, with thousands of new genes being adopted over the past millennia. At this time, our brain was shaped differently, according to a recent study that created virtual imprints of the internal bony braincase of one of these ancient humans. Some evidence suggests that Europeans made cheese for some 4, years before any of them developed the ability to properly digest lactose. That's evolution in action. A similar trend of brain reduction was found by another study that compared braincases from humans and human relatives that lived 1. In evolutionary terms, this means that some people are born without this trait, and they do just fine. But no worries, the lack of this muscle has no effect on hand or grip , so those of you who lack it are just fine. It's like they say: Proof of evolution that you can find on your body. Among them are height, head circumference in infants, and hip size in females—crucial for giving birth to those infants. Is the questioner interested in whether changes will take place in Homo sapiens or whether new Homo species will appear? Genes for fair hair also cause lighter skin color, which allows the body to make more vitamin D in conditions of scarce sunlight. The reality is that every single living thing on Earth is constantly evolving, at least to some extent. Virtually every country has increased their average height because we have much better nutrition, but the Dutch have rocketed skyward at a much faster rate. These beneficial mutations get passed down to the survivors of each generation, as these mutations and their adaptive traits become more common in the general population. Researchers looked at DNA from , people, tracking 8 million mutations to see which genetic changes were changing in frequency. Here's how you can tell. The only constant in nature is change. A slow process, in short, that happened aeons ago. A few lucky individuals happened to acquire a mutation in the lactase gene that allowed it to stay turned on, even after infancy, and therefore allowed them to rely more heavily on dairy later in life. Evolution takes care of it, so to speak. Evolution is defined as a change in gene frequencies over time, which means that over generations, there will be changes in the gene pool, and humans experience those changes as much as any other organism. The Netherlands is vertically gifted A more modern example:
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