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Lecture 45

BIOL 1000 Lecture 45: Lecture 45
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Department
Biological Sciences
Course
BIOL 1000
Professor
Kevin G.Scott
Semester
Fall

Description
o982 Do Individuals Evolve? Common belief – individual organisms evolve during their lifetime ***misconception Natural selection acts on individuals Each individual’s combination of traits affects its survival & reproductive success Evolutionary impact of natural selection only evident in the changes in a population over  generations  Population = a group of individuals of the same species that live in the same area and interbreed Measure evolution as change in prevalence of certain heritable traits in a population over a span of generations  Different populations of same species may be isolated from one another, with little interbreeding  (little exchange of genes) Common in populations confined to widely separated islands or in different lakes Gene pool = the total collection of genes in a population at any one times Consists of all the alleles in all the individuals making up a population Micro-evolution = occurs when relative frequencies of alleles in a population change over a number of generations Mutation and Sexual Reproduction Produce the Genetic Variation that Makes Evolution Possible Darwin couldn’t explain the cause of variation among individuals, or how variations passed from  parents to offspring He only knew that natural selection favoured some heritable traits over others, and was the primary mechanism for change  Mendel discovered the hereditary processes required for natural selection  Not all variation in a population is heritable Phenotype results from a combination of inherited genotype and environmental influences Many characters that vary
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