BIOL 123 Lecture Notes - Lecture 16: Sea Urchin, Reproductive Isolation, Meiosis
Document Summary
The biological species concept is based on the reproductive isolation of organisms that are given the opportunity to mate. Species were classified to taxonomical rules due to appearance. Plants and animals that were similar to each other were put together, without any formal rules where one species starts and stops. People would split the species, as the slightest changes were important, while other animals were pooled together as a separate species. Evolutionary scientists focused on the biological aspects, rather than taxonomy, Genes can flow among the individuals where gene flow wasn"t possible, where the individuals can mate and have offspring given the opportunity so species were separate units, and can share genes. When individuals of different species mate, but there is no successful development of offspring. Animals/plants have a season which where they mate, and if the seasons are different or have different habitats, there won"t be any exchange.
