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Lecture 10

BIOL 1F90 Lecture 10: BIOL 1F90 lecture 10 winter 2016

Biological Sciences
Course Code
Fiona Hunter

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Monday, January 25, 2016
Lecture 10
-reproductive success
likelihood of an individual contributing fertile ospring to the next generation
attributed to two categories of traits
-certain characteristics make organisms better adapted to their environment and
more likely to survive to reproductive age
-traits that are directly associated with reproduction such as the ability to find a mate
and the ability to produce viable gametes and ospring
Modern Description of Natural Selection
1. Within a population allelic variation arises from random mutations that cause
dierences in DNA sequences
2. Some allele encode proteins that enhance an individual’s survival or reproductive
capacity compared to other members of the population
3. Individuals with beneficial allele are more likely to survive and contribute their alleles to
the gene pool of the next generation
4. Over course of many generations, allele frequency of many dierent genes may change
through natural selection, thereby significantly altering the characteristics of a
Darwinian Fitness
-relative likelihood that a genotype will contribute to the gene pool of he next generation
as compared with other genotypes
-measure of reproductive success (not physical prowess)
-hypothetical gene with alleles A and a
-AA, Aa, aa
-suppose average reproductive successes are
-AA produces five ospring
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