BIOL 1001 Lecture Notes - Lecture 20: Neoteny, Flattening, Heterochrony
Document Summary
Bio 1001 macroevolution continued march 10th, 2017. Duplicated genes can result in dna replication and crossing over. As long as one chromosome maintains its original function the duplicate is free to be mutated. We can get big changes in the body by altering the expression of a gene and regulating when it turns on and off. Isometric growth adult proportions are not significantly different than younger offspring: ex. Allometric growth relative growth rates of different body parts during. We can compare timing and pace of development between closely related species therefore looking at heterochrony. Juveniles are differentiated from adults by their inability to reproduce not by specific morphology. Animals some somatic cells can develop at a certain time. Some species can get a mutation that allows them to reproduce earlier than normal. Juvenile are aquatic: then, reorganization of body, adult tiger are more on land, this is an example of somatic development same rate (neoteny)
