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Unformatted text preview: Evolution Can describe the 4 steps of Evolution Can show how the Hardy-Weinberg principle affects allele distribution and frequency. Describe and predict how sexual selection and selective breeding affects the organism in its evolution. Know how evolution has led to major divisions of classification. Evolution 4 steps: 1. Overproduction: More offspring can be produced than can survive to maturity. For example, each female deer has one or more offspring per year for many years in a lifetime. This multiplication could increase the total number of deer in a short time. But each new deer needs food and is vulnerable to predators and disease, so not all of the deer live for very long. 2. Inherited Variation (Genetic Variation): Within a population, individuals have different traits. 3. Struggle to Survive/existence (Survival of the fittest): Individuals must compete with each other in what Darwin called a struggle for existence. 4. Successful (Differential) Reproduction: Darwin concluded that organisms with the best adaptations are most likely to survive and reproduce. And through inheritance, the adaptations will become more frequent in the population. So, populations may begin to differ as they become adapted to | P a g e Gautham 3/6/2010 different environments, even if they descended from the same ancestors. This conclusion is the core idea of Darwins theory. Hardy-Weinberg principle: The proportion of homozygotes and heterozygotes in a population is not altered by meiosis or sexual reproduction. Homozygote: an individual having two identical alleles of a particular gene or genes....
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- Spring '09