Download Chapter 5 Evolution and Gene Frequencies POPULATION AND

Chapter 5
Evolution and Gene
Frequencies
POPULATION AND GENE
POOLS
 Population are group of individuals of the
same species that occupy a given area at
the same time and share a unique set of
genes
THE HARDY WEINBERG
THEOREM
 Their combines ideas became known as
the hardy Weinberg theorem
POPULATION SIZE,
GENETIC DRIFT, AND
NEURTAL EVOULTION
 Chance events influencing the
refequencies of genes in population
result in genetic drift
 Because genes frequencies are changing
independently of natural selection,
genetics drift is often called neutral
evolution
NATURAL SELECTION
REEXAMINED
 Weinberg equilibrium is selection
pressure
Balanced polymorphism
and heterozygote
superiority
 Balanced polymorphism occurs when
different phenotogyes are maintain