Natural selection is the process where individuals with advantageous traits are more likely to survive, reproduce, and pass on those traits to offspring. It acts on phenotypic variation within a population, which arises from genetic differences. Favorable traits increase in frequency over generations, while less advantageous traits diminish. This mechanism […]
Microevolution and Macroevolution are two scales of evolutionary change that describe different processes and outcomes in the evolution of organisms. Microevolution refers to small, gradual changes that occur within a population over a relatively short period. These changes typically involve alterations in allele frequencies due to natural selection, genetic drift, […]
Neo-Darwinism, also known as the Modern Synthesis, is the theory of evolution that combines Darwin’s natural selection with Mendelian genetics. It incorporates the understanding of genetic variation, mutation, gene flow, and genetic drift as the mechanisms driving evolutionary change. Neo-Darwinism emphasizes that evolutionary change is a gradual process, shaped by […]
Darwinism refers to the theory of evolution by natural selection, originally proposed by Charles Darwin. It suggests that organisms with traits better suited to their environment are more likely to survive and reproduce, passing these beneficial traits to their offspring. This process leads to gradual changes in populations over time, […]
Neolamarckism is a modern interpretation and modification of Lamarck’s theory of evolution. While it acknowledges the inheritance of traits acquired during an organism’s lifetime, it incorporates the idea that epigenetic factors play a role in the inheritance of such traits. Neolamarckism blends Lamarck’s original concepts with newer scientific findings, particularly […]
Reproductive isolation refers to mechanisms that prevent different species or populations from interbreeding and producing viable offspring. It is crucial for maintaining species boundaries and promoting speciation. Reproductive isolation can occur through prezygotic or postzygotic mechanisms, leading to the formation of new species over time. This is an MCQ on […]
Genetic variability refers to the diversity in gene frequencies within a population, which leads to differences in the genetic makeup of individuals. It plays a crucial role in evolution, as it provides a foundation for natural selection to act upon. Genetic variability can arise through mutations, gene flow, sexual reproduction, […]
Adaptive radiation is the process by which a single ancestral species rapidly diversifies into a wide variety of forms to exploit different ecological niches. This phenomenon occurs when new environmental opportunities arise, such as the colonization of new habitats or the extinction of competitors. Adaptive radiation often results in the […]
Lamarckism, also known as Lamarckian evolution, is an early theory of evolution proposed by Jean-Baptiste Lamarck. It suggests that organisms can pass on traits acquired during their lifetime to their offspring, leading to evolutionary change. This theory emphasizes the role of environmental influences and the use or disuse of body […]