BGYB51H3 Lecture 17 Notes Nov 5

37 views1 pages
11 Aug 2010
BGYB51H3 Lecture Notes
-selection differential is the mean value of trait between successful breeders and whole
S = P* - P
-if S>0, increase in trait value, if S<0 decrease in trait value, S=0 mean trait value
-larger values of S, stronger selection occurring
-the closer S is to the population mean, weak selection
-R is the evolutionary response to selection
R = O* - O
-O means that there is no evolutionary change and is an estimate from P
O* - O rise R
h2 = ______ =____ =___ R = h2S
P* - P run S
-heritability is the response to the selection divided by the selection differential
-even if strong selection, if heritability is low there is low direction of change in offspring
-relative fitness is the number of surviving offspring divided by mean number of surviving
-selection gradient is the relation between trait value and fitness
-selection gradient is more commonly measured than selection differential
S = selection gradient/variance
-coevolution is when interacting species experience reciprocal evolutionary change due to
natural selection imposed by each on the other
Unlock document

This preview shows half of the first page of the document.
Unlock all 1 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.