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

Transcript
I. Natural Selection
Who Lives
Who Dies
A. Darwin Proposed 2 Things
1.
2.
Evolution occurs
Evolution occurs due to Natural Selection

Who do you think chooses who sticks
around and who doesn’t?
The Environment
B.
The environment chooses which
organisms will survive and reproduce
based on their phenotype
C.
Steps to Natural Selection
1.
Variation is the raw material for natural
selection
a. Within a population there is a
variation in traits (phenotypes)
2.
Living things face a constant struggle for
existence
a. Produce more offspring than there is
room and food for, so they must compete
to survive
3.
Only some individuals survive and
reproduce
a. Some individuals are more “fit” for the
environment or for life in general
ex. Resistance to disease
4. Natural selection causes genetic change
a. Each generation consists of individuals
with traits(phenotypes) that made them
more “fit”, so over time, alleles for those
traits will increase in frequency
5.
Species adapt to their environment
a. selection tends to make organisms
better suited to their environment
C. Lethal genes are kept in the gene pool if
in the heterozygous form because those
individuals will not show the lethal
phenotype
Document related concepts

Deoxyribozyme wikipedia, lookup

Microevolution wikipedia, lookup

Designer baby wikipedia, lookup

Quantitative trait locus wikipedia, lookup

Population genetics wikipedia, lookup

History of genetic engineering wikipedia, lookup

Human genetic variation wikipedia, lookup

Biology and consumer behaviour wikipedia, lookup

Behavioural genetics wikipedia, lookup

Heritability of IQ wikipedia, lookup

Genetic drift wikipedia, lookup

Transgenerational epigenetic inheritance wikipedia, lookup

Polymorphism (biology) wikipedia, lookup

Natural selection wikipedia, lookup

Koinophilia wikipedia, lookup

Group selection wikipedia, lookup

Dual inheritance theory wikipedia, lookup

Twin study wikipedia, lookup