BI110 Final: Biology Final Exam Review
Document Summary
Dna is enclosed in a nucleus in eukaryotes but not prokaryotes. Gregor mendel was the first to take steps in uncovering the basic principles of heredity. Extinction can occur if the environment changes too quickly for adaption. There have been 5 major extinctions: dinosaurs: cretaceous/palaeogene period, triassic/jurassic (~205 million years ago, permian/jurassic (~251 million years ago, late devonian (375-360 million years ago, ordovician/silurian (450-440 million years ago) Biological evolution: process that results in hereditable changes in a population/ Gene flow: genes move between subpopulations of a species through dispersal. Genetic drift: genetic changes in a population due to a random process in which a few individuals start a new population. Macroevolution: evolution of a new species from existing groups. Microevolution: changes in allele frequencies within populations. Natural selection: individuals with genes that allow them to achieve higher fitness are favoured. Their genes become more common in following mutations. The universe is composed of matter and energy.
