A molecular clock is a method used in evolutionary biology to estimate the timing of evolutionary events. It assumes that genetic mutations accumulate at a relatively constant rate over time. By comparing DNA, RNA, or protein sequences between different species, scientists can determine the number of mutations and infer the […]
Allopatric Speciation and Sympatric Speciation are two major modes of speciation, the process by which new species arise. These two types differ in terms of geographic isolation and the mechanisms that drive the speciation process. Allopatric Speciation occurs when a population is geographically separated into two or more isolated groups […]
Homology and analogy are key concepts in evolutionary biology that describe the relationship between structures in different organisms. Both terms refer to similarities, but the origins and functions of the structures differ. Homology refers to traits that are similar due to shared ancestry. These structures may not necessarily perform the […]
Parallelism in biology refers to the independent evolution of similar traits or features in different lineages or species in response to similar environmental pressures, without a common ancestor for that specific trait. It is often observed in evolutionary biology, particularly in cases where organisms from different lineages evolve similar structures […]
Eukaryotic cells evolved from prokaryotic ancestors through endosymbiosis, a process where one cell engulfed another, leading to a mutualistic relationship. This theory suggests that mitochondria and chloroplasts, present in eukaryotes, are descendants of ancient prokaryotes, likely aerobic bacteria. Over time, these engulfed prokaryotes became essential organelles, providing energy efficiency. The […]