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Lecture 17

BIOL 215 Lecture Notes - Lecture 17: Macroevolution, Stabilizing Selection, Heritability


Department
Biology
Course Code
BIOL 215
Professor
Neil Price
Lecture
17

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1. Macroevolution – oct 3rd tuesday
If you choose individuals at random, then there is no possibility of selection.
Result is a high amount of mutation
Estimate the rate of deleterious mutation
When nat sel cant act, there is a progressive decline in their fitness
“purifying, stabilizing selection”
fundamental theorem of natural selection
the greater the variation, the stronger the selection will act to reduce it
STUDY WTF LOGS HOW IS THAT SO RELEVANT
Genetic source of variance
Genetic variance in fitness -
DIRECTIONAL SELECTION – for improvement
Many character`s heritability is 0.5
What happens if you stop selecting?
Don`t know why or how the average values are stablished
There is an effect of natural selection pushing against the effects of natural
selection
Additive effect – 2 genes A and B
A genes individuals tend to have more bristles
If you have both, you have more than the average
Genetic variance
What does the order in the alleles mean, if the phenotype doesn`t change?
Combination possibilities???????
find more resources at oneclass.com
find more resources at oneclass.com
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