4-Natural Selection I

4-Natural Selection I - Selection...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Selection How does Selection change allele  frequencies over time? How does Selection affect genetic  variation? Does Selection always lead to  ‘improvement’?
Background image of page 1

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

View Full DocumentRight Arrow Icon
How does Natural Selection change allele and  genotype frequencies over time?
Background image of page 2
Observed change in the frequency of the melanic  allele during the industrial revolution. years p .01 .9
Background image of page 3

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

View Full DocumentRight Arrow Icon
Darwinian fitness The ability of an individual to  survive  and  reproduce  in its environment. probability of survival   average Fitness =          from birth    X     fecundity         to reproduction
Background image of page 4
Computing fitness: survival differences 36 45 2 83 Data after H. B. Kettlewell
Background image of page 5

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

View Full DocumentRight Arrow Icon
Modeling selection with the Hardy-Weinberg  equation Selection against recessive alleles W AA W Aa W aa 1 1 1-s
Background image of page 6
What can we learn? 1. What does the equilibrium look like? 1.
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

4-Natural Selection I - Selection...

This preview shows document pages 1 - 8. Sign up to view the full document.

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