4 - STABALIZING SELECTION o SELECTION FOR THE MIDDLE...

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: STABALIZING SELECTION o SELECTION FOR THE MIDDLE FITNESS, ELIMINATES EXTREMES o Favors heterozygote AA= p= 1-S Aa=2pq=1 aa=q=1-t P = p(1-S) + 2pq * (1) / p(1-S) + 2pq + q(1-t) o Bottom = p - pS + 2pq + q qt and p+2pq+q=1 o SO p = p(1-s)+pq/ 1-ps-qt dP = p-p o (p(1-S)+pq/1-ps-qt) - P o multiply p by denominator o add both neumerators (bottom will be total) o Cancel out the p+2pq+q because it equals one o Factor out the Ps o Youll get 1-p which will equal q o So you will get pqs+pqt/total Which will equal pq(qt-ps)/total for the change in p The graph of p in a pure heterozygote world would remain constant over time o If p = then dP = 0 o If p is large then dP = negative Consequence of stabilizing selection for heterozygotes, the fitness of p will eather lower or increase in...
View Full Document

Page1 / 2

4 - STABALIZING SELECTION o SELECTION FOR THE MIDDLE...

This preview shows document pages 1 - 2. Sign up to view the full document.

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