2022年8月6日 · The Wikipedia definition is suitable to say that species 1 and 3 share common descent. Common descent is a concept in evolutionary biology applicable when one species is the ancestor of two or more species later in time.

2025年2月26日 · B'H The fundamental issue stems from a misunderstanding of the scientific method or, more broadly, the nature of science itself. A crucial distinction must be made between empirical science, which is

The concepts of Identity By Descent (IBD) vs Identity By State (IBS) are central in population genetics, yet I fail to fully wrap my head around the definitions. You can find examples where my understanding of IBD vs IBS is quite poor in @DermotHarnett's answer here or in the comments with @PaulStaab here .

2018年7月22日 · However, the author claims the log Bayes factor actually means the D. Graph is $2^{111,823}$ times better than the Tree. Which clearly shows common descent (Tree) is a vastly inferior explanation for the data than the D. Graph. The issue is there is an enormous amount of data, which can artificially inflate the log Bayes factor.

Just because two creatures have some common DNA doesn't mean that those creatures got that DNA from a common ancestor at the time when they diverged. DNA can be introduced by vectors such as viruses. So that is to say, two creatures that diverged, say, a hundred million years ago could have some common DNA that they acquired more recently, like ...

2015年8月4日 · If I understand correctly, the concept of the LUCA (last universal common ancestor) is based on the hypothesis that archaea and bacteria share common ancestry. In the realm of mathematics, the same discoveries have often been made more than …

A case could exist where two individuals of different ethnic groups would have the same family name but that would not be due to common descent but only to "chance". $\endgroup$ – Remi.b Commented Jan 6, 2016 at 17:09

These proposals were not formally made in Darwin's On the Origin of Species (1859), but his general ideas of common ancestry were built upon in Thomas Huxley's Evidence as to Man's Place in Nature (1863) and then Darwin's The Descent of Man (1871). How was the resemblance between apes and humans explained prior to this shift in thinking?

2018年12月21日 · Darwin did propose that all extant organisms have a common ancestor: Therefore, on the principle of natural selection with divergence of character, it does not seem incredible that, from some such low and intermediate form, both animals and plants may have been developed; and, if we admit this, we must likewise admit that all the organic beings which …

2023年10月24日 · The idea of phylogenic trees of species and extinct common ancestors, as in the case of different primates such as man and chimp, is the standard scientific interpretation of the fossil record and (more recently) powerful DNA sequence analysis, and the reader unfamiliar with this is left to read, e.g., the linked Wikipedia article on the topic.