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 […]
Botany questions in PhD entrance exams assess a candidate’s deep understanding and analytical thinking in advanced plant sciences. They often focus on specialized topics such as advanced plant genetics, molecular biology techniques, stress physiology, and plant-microbe interactions. Questions may involve interpreting experimental data, proposing research hypotheses, and applying complex concepts […]