lecture 7 population subsdidvion

Card Set Information

Author:
doncheto
ID:
309080
Filename:
lecture 7 population subsdidvion
Updated:
2015-10-05 21:22:05
Tags:
genetics
Folders:

Description:
fdsf
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user doncheto on FreezingBlue Flashcards. What would you like to do?


  1. 4 conditions for Natural Selection:
    • 1) Variation in traits
    • 2) Heritability
    • 3) Overproduction of offspring
    • 4) Survival and reproduction is not random
  2. FITNESS:
    • – the number of offspring an individual produces
    • that survive to reproduce themselves

    • Fitness = 1.0 means that individuals of this
    • phenotype are successfully passing on 100%
    • of their genes, on average
  3. Sources of variation
    • • Gene flow: immigration
    • • recombination
    • • ultimately, from mutation
  4. Scale of Natural Selection
    • Natural selection happens at the scale of an
    • individual
    • • Evolution happens at the scale of a population
  5. Three kinds of natural selection:
    • -Directional selection
    • – Stabilizing selection
    • – Disruptive selection
  6. Nonrandom mating
    not mating by chance
  7. Inbreeding (F)
    • consanguineous mating – all loci
    • affected
  8. Outbreeding
    • – mating between more distantly related
    • individuals than those drawn by chance – all loci
    • affected
  9. Assortative mating
    • (+) and (-) based on phenotype –
    • only those loci involved in or linked to the trait
  10. Allozygous:
    • genotype where two alleles came from
    • completely different sources
  11. Autozygous:
    • genotype where two alleles are from
    • identical ancestry
  12. Identity by Descent (IBD):
    • a segment of DNA shared
    • by 2 or more individuals from a common ancestor
  13. Measuring population fragmentation:
    F statistics
    • • The degree of differentiation among
    • fragments can be described by partitioning the
    • overall inbreeding into components within and
    • among populations (F statistics)
  14. FIS:
    • Individuals (I) are inbred
    • relative to expectations of random mating within
    • Subpopulation (S)
  15. FST:
    • Sub-populations (S) are inbred relative to
    • Total population (T)
  16. FIT:
    • Level of heterozyosity (or IBD) of the
    • individual relative to Total population
  17. Fst = 0
    popula0ons mixed
  18. Fst = 1
    • populations completely
    • different
  19. What is an AMOVA
    • Analysis of molecular variance
    • • Just like an ANOVA (analysis of variance)
    • • A partitioning of variance:
    • – Is most of the variation due to:
    • Among samples?
    • Among site?
  20. What happens if we combine gene
    flow and genetic drift?
    • (1) Divergence is dependent only on mN, not on the
    • proportional contribution of migrants (m).
    • (2) Even very little gene flow (mN~1) can have a major effect
    • on population structure.

What would you like to do?

Home > Flashcards > Print Preview