Chapter 23- The Evolution of Populations

Chapter 23- The Evolution of Populations - Chapter 23 The...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 23 The Evolution of Populations Evolution occurs in populations, not in individuals Western historical Context Gregor Mendel (1822-1884) o Australian monk whose breeding experiments with peas shed light on the rules of inheritance. o A contemporary of Darwin, but his work was overlooked until the 20 th century The Modern Synthesis (early 1940s) o A conceptual synthesis of Darwinian evolution, Mendelian inheritance, and modern population genetics o Potential for rapid population growth when resources are not limiting (unlimited resources) o Resource availability generally limits population size. o Competition to the resources (struggle for existence) o Phenotype variability (morphology, physiology, behavior, etc.) o Natural Selection: Survival and reproduction of the “fittest” individuals; Artificial Selection- animals breeding; choose what species to breed o Some variability results from heritable genotype differences o Adaptive Evolution: a change in the phenotype constitution of a population owing to selection on heritable variation among phenotypes that changes the genotypic constitution of the population Phenotype vs. Genotype Phenotype- all the expressed traits of an organism Genotype- the genetic make-up of an individual (it’s full complement of genes and the 2 alleles that comprise each locus) Diploid- get 2 copies Evolution- a change in allele frequency in a population (a change in the gene pool) over time Population = all of the individuals of a species in a given area
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Population Genetics - examine the frequency, distribution, and inheritance of alleles within a population Hardy-Weinberg Equilibrium - the population genetics theorem that states that the frequencies of alleles and genotypes in a population will remain constant unless acted upon by non-Mendelian processes… A control situation where no evolution is taking place
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

Chapter 23- The Evolution of Populations - Chapter 23 The...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online