Without heredity there can be no biological evolution.The core of the theory of evolution follows from a few simple observations:
- There is variation within species.
- We can see this everywhere.
No two animals or people look exactly the same (or they must be identical twins).
- This is a little less easy to see, but we can also confirm this from experience.
Children don’t look exactly the same as their parents, but they often seem to be on them. Since the 20th century, we know that these hereditary characteristics are mainly transmitted by DNA.
- If an animal is better camouflaged against predators or is better able to catch prey, it has a greater chance of survival (natural selection), so it is more likely that animals in the next generation are offspring of animals in the current Generation that have these properties.
From these three observations it is logical that evolution should take place: some variants will become more or less frequent from generation to generation within a species.This is of course not the whole theory of evolution: There is also non-hereditary variation and there are accidental fluctuations in frequency (genetic drift). Yet there is a deep link between heredity and evolution: without heredity there is no biological evolution.
Heredity was a subject that made the Charles Darwin-the founder of the theory of evolution-more difficult to convince of his theory of evolution.Heredity was when 芒 鈧?艙The origin of Species芒 鈧?was published in 1859 namely still a poorly understood phenomenon.
It was thought that descendants simply took over the average construction of their parents, with some variation in them.From this notion of heredity, you can resolve the following counter-argument:
In a population there are two external properties, namely a white coat and a black coat.Let’s say that a black coat is the most advantageous. If descendants always take over the average shape of their parents, you would think that this leads to a population with a grey coat. The beneficial of a black coat would only mean that the resulting coat color would become slightly darker grey, but certainly not black.
Gregor Mendel-The founder of the Genetic theory-published his famous work on heredity only in 1865.Remarkably enough, his book with Darwin was on the bookshelf. To the state of the book, where Page芒 鈧劉 s had not been cut out yet, one could see that he never read this book. If he had done so, he would probably have had a much better understanding of evolution.
Since Mendel’s work, we know that hereditary properties can be dominant and recessive, that black and white does not necessarily lead to grey, and we can better understand many phenomena in evolution.