Class Notes (835,673)
United States (324,214)
BSC 315 (58)
Lecture 28

BSC 315 Lecture 28: 19
Premium

6 Pages
57 Views
Unlock Document

Department
Biological Sciences
Course
BSC 315
Professor
Edwin Stephenson
Semester
Spring

Description
19. Genes in Populations Population Genetic Terms Population: a group of breeding individuals Population genetics: allele frequencies in populations and mechanisms of change over time Evolution: change in allele frequency within a population over time Calculating Allele Frequencies A static view of allele frequency: the HardyWeinberg equation Imagine gene with alleles A and a o 36 have genotype aa (recessive phenotype). What are the frequencies of genotype AA and Aa? The HardyWeinberg equation: p + 2pq + q =1 2 o P is the frequency of allele A and q is the frequency of allele a. o P + q = 1 o P is the frequency of AA homozygotes 2 o Q is the frequency of aa homozygotes o 2pq is the frequency of the Aa heterozygotes 2 If aa = q = 0.36, then q = 0.6 Since p + q = 1, p = 0.4 Using this info: o AA = p = (0.4) = 0.16 o Aa = 2pq = 2 x (0.4 x 0.6) = 0.48 If one genotypic frequency is known, all others can be calculated (assuming the population is in equilibrium) HardyWeinberg Equilibrium HardyWeinberg equilibrium: the population is stable and allele frequencies do not change over time. If so, allele frequencies can be calculated using the HW equation. Assumptions:
More Less

Related notes for BSC 315

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit