BIO 5 Lecture Notes - Lecture 3: Sympatric Speciation, Cell Membrane, Sequential Hermaphroditism
Document Summary
Once two traits are separated then over enough time these groups come back together they are no longer able to reproduce. Sympatric speciation : the same land, different population use different components of the environment. Phylogeny : evolutionary history of a group of organisms, the nodes represent speciation events and each lineage has split into two species. Sister groups two lineages most closely related to each other. Type of sexual reproduction because there is still fertilization happening called hermaphotisim: simultaneous hermaphrodites both male and female at the same time, sequential hermaphrodite , protandry male hormones. Animals that are male first and at some point in their lives become females: protogyny female first, male later. Parthonogenesis ambiguous; many different forms so its not necessarily sexual or non- sexual reproduction. It is development of an embryo from an unfertilized egg: amiotic no meiosis takes place, egg produced is done by mitosis and has same chromosome number, meiotic involves meiosis.
