10) - Bio Notes (12/2/10) Obsv RR=18 0.58 RB=0 BB=13...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Bio Notes (12/2/10) Obsv Exp RR=18 p 2 = 0.38 = 10.5 p=freq(R)= 36/52= 0.58 RB=0 2pq=0.49 = 15.2 q=freq(B) = 26/52= 0.42 BB=13 q 2 = 0.18 = 5.6 Number of Alleles=31 After “Mating” RR= 8 RB=19 BB=4 Hardy-Weinberg Assumption Overarching assumption: No evolutionary forces are acting What sorts of forces are we talking about? 1. Mutation Ultimate source of: genetic variation But it’s rare, so…. no effect in short term 2. Non-random mating
Background image of page 1

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

View Full DocumentRight Arrow Icon
Positive: Like w/like, increase hoomozygote freq Negative: Unlike types mate, increase heterozygote freq 3. Genetic Drift 4. Natural Selection 5. Gene flow (migration) If none are happening: Allele freqs don’t change Popln in H-W freqs No evolution Random Genetic Drift Genetic Drift: Random changes in allel freqs Consider a new mutation (allele) ‘a”… Initially polymorphic (arrow pointing to it saying “More than one allele”) and arrows to below and “fixation” under freq=1 (all alleles=a) Extinction/loss
Background image of page 2
o freq=0 (all allele=A) What determines mutations fat? fixation
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

10) - Bio Notes (12/2/10) Obsv RR=18 0.58 RB=0 BB=13...

This preview shows document pages 1 - 4. Sign up to view the full document.

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