Download Microevolution is a change in a population*s gene pool

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

Pharmacogenomics wikipedia, lookup

Biology and consumer behaviour wikipedia, lookup

Quantitative trait locus wikipedia, lookup

Behavioural genetics wikipedia, lookup

Gene desert wikipedia, lookup

Mutation wikipedia, lookup

Saethre–Chotzen syndrome wikipedia, lookup

Nutriepigenomics wikipedia, lookup

Genetic testing wikipedia, lookup

Gene expression profiling wikipedia, lookup

Gene nomenclature wikipedia, lookup

Vectors in gene therapy wikipedia, lookup

Therapeutic gene modulation wikipedia, lookup

Gene wikipedia, lookup

Epistasis wikipedia, lookup

Genome evolution wikipedia, lookup

Gene therapy wikipedia, lookup

Heritability of IQ wikipedia, lookup

Point mutation wikipedia, lookup

The Selfish Gene wikipedia, lookup

Polymorphism (biology) wikipedia, lookup

Public health genomics wikipedia, lookup

Artificial gene synthesis wikipedia, lookup

Site-specific recombinase technology wikipedia, lookup

Gene expression programming wikipedia, lookup

History of genetic engineering wikipedia, lookup

Genetic engineering wikipedia, lookup

Koinophilia wikipedia, lookup

Genome (book) wikipedia, lookup

Designer baby wikipedia, lookup

Human genetic variation wikipedia, lookup

Genetic drift wikipedia, lookup

Population genetics wikipedia, lookup

Microevolution wikipedia, lookup

Transcript
Microevolution is a change in a
population’s gene pool
Ch. 14.4
Populations and Their Gene Pools


Population is a local group of individuals
belonging to the same species
Natural selection becomes clear when an
ENTIRE population is tracked over time

GENE POOL  consists of all the alleles in all
the individuals that make up a population
–
Think of it as the reservoir for the next generation to
gather it’s genes

Where genetic variation is stored
Changes in Gene Pools


Causes of genetic variation  mutuations and
sexual recombination (random occurrences)
Natural selection is NOT random
–
Environment favors genetic combinations that
CONTRIBUTE to survival/reproductive success

Mendel’s and Darwin’s work combined lead us
to MICROEVOLUTION  a generation to
generation change in the frequencies of alleles
within a population
Genetic Drift


A change in the gene pool of a population due
to chance  GENETIC DRIFT
ALL populations are subject to genetic drift
–

Smaller pop; more impact genetic drift has on that
pop.
The smaller the sample, the greater the chance
that the results will differ from an expected
result
–
Ex: coin tossed 10 times vs. 1,000 times
Gene Flow and Mutation

Exchange of genes with another pop.  GENE
FLOW
–
Fertile individuals or their gametes migrate btwn
pops.


Change in organism’s DNA  MUTATION
Mutations are esp. important as a source of
variation in asexually reproducing organisms
that clone themselves rapidly
Natural Selection and Fitness


Natural selection is a BLEND of CHANCE and
SORTING
FITNESS  contribution that an individual
makes to the gene pool of the next generation
compared to other individuals