2. Humans have had a role in the changing of multiple species, from designer dogs and cats, to larger and sweeter ears of corn; but I chose the humble chicken to write my initial discussion post on. Modern chickens are very different than they were decades ago, thanks mostly to selective breeding. There are two basic types of chicken now, and they egg-layers and meat chickens. Between the two of them, the egg-layers resemble the original chicken the most, and even they have been tinkered with some, by breeding the chickens that had the highest amount of eggs laid at one time, resulting in a breed of chicken that lays pretty much daily. The other type of chicken is the more interesting, at least in my opinion. The meat chicken, or broiler, is the result of breeding chickens that have a mutation in the gene that regulates their metabolism, causing them to gain weight at an increased rate. Interestingly enough, this is also the gene that can lead to obesity in humans. One of the resources I found while looking up information for the topic was a link to a project that compares the growth rates between the two types of chickens, starting from when they hatched, and ending when they were six weeks old. They were fed the exact same diets, but by the end of the experiment, the meat chickens weighed in about four times greater than the egg-layer chickens, clearly showing that the mutation has made this breed of chicken perfect for the dinner table.
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