Biological evolution

Biological evolution - Chapter 3 Evolutionary Forces...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 3: Evolutionary Forces Biological evolution = genetic change over time Microevolution = changes in frequency of alleles from one generation to next Breeding population = a group of organisms that tend to choose mates within the group. *Problems: Percentage of people married to each other in town varies / subjective as to how to define a true “breeding population” Determining difference between total census population / breeding population After population is defined, determine genotype/allele frequencies Genotype frequency: Measure of relative proportions of different genotypes within population Number of people w/ each genotype ___________________________________________ = Frequency Total Number of People E.G. 18 people with genotype NN in population of 200 18/200 = . 009 = frequency Frequencies = proportions Total frequency of all genotypes add up to 1 Allele frequency: Measure of relative proportions of different alleles within population. Number of each allele _____________________________ = Allele frequency Total number of alleles E.G. In Example, total number of alleles is 400 b/c each person has 2 alleles. Number of alleles for each genotype (x) number of people within genotype = Number of M alleles for each genotype E.G. 2 (x) 98 = 196 M Alleles, etc. for all frequencies. Then divide total number by 400. All alleles also add up to 1 If man with genotype MN mates with woman with genotype MN 25% offspring = MM, 50% = MN, 25% = NN Hardy –Weinberg equilibrium = relates allele frequencies in population to expected genotypes in next generation
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern