Download Natural Selection

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Population genetics wikipedia, lookup

Introduction to evolution wikipedia, lookup

Saltation (biology) wikipedia, lookup

Genetics and the Origin of Species wikipedia, lookup

Evolution wikipedia, lookup

Hologenome theory of evolution wikipedia, lookup

Natural selection wikipedia, lookup

Inclusive fitness wikipedia, lookup

Sexual selection wikipedia, lookup

The Descent of Man, and Selection in Relation to Sex wikipedia, lookup

Evolutionary mismatch wikipedia, lookup

Co-operation (evolution) wikipedia, lookup

Transcript
Natural Selection
Darwin’s Breakthrough Theory
The Struggle for Existence
 Darwin believed that there is a constant
struggle for survival in the natural world
 The faster or “smarter” the predator the
more likely it is to capture food
 The better camouflaged, protected, or
cunning the prey the more likely it would
not be eaten
Survival of the Fittest
 Fitness – how well an individual is able to
survive and reproduce in a specific
environment
 Adaptation – an inherited trait which makes an
individual more fit in its environment
 Darwin called this natural selection because of
its similarity to artificial selection
How Natural Selection
Works
 All populations have genetic diversity
(they are not 100% identical)
 If an individual is born/produced that has
trait which make it more fit it then is more
likely to survive and reproduce
 When it reproduces there is a higher
chance that the beneficial traits will be
passed on to its offspring
Natural Selection
 Over very long periods of time this
selection can lead to the entire
population having the similar beneficial
traits which then makes the entire
population more fit
 Peppered moth activity
 Survival of the Sneakiest
Evidence of Evolution
 The fossil record
 Shows the gradual
change in species
over LONG periods of
time
Geographic Distribution of
Living Species
 The existence of
similar but different
species on different
continents leads to
two conclusions
 The species evolved
from a common
ancestor
 The continents where
once connected
(Pangea)
Homologous Body
Structures
 Structures with the same developmental
origins and internal structures but are
used for different things
Vestigal Organs
 “left over” structures from a common
ancestor
Similarities in Embryology
 The early stages of development of
animals with backbones are very similar