Diversity
Taxonomic Categories
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
Hierarchy
From most general to most specific
Binomial Nomenclature
System used to identify all organisms on Earth
Identifies an organism by its genus and species (ex. Humans-homo sapiens)
Developed by Linnaeus in the 18th century
Identifying Species
3 methods:
Morphology
Form and shape
It is simple but there are natural variations in population
Biology
If species are able to have sex and produce viable offspring
It is widely used however cannot always be used due to geographic separation, asexual reproduction and extinction of fossils
Phylogeny
Evolutionary relationships
Can …show more content…
Giraffes with long necks
Disruptive Selection
Occurs when selection favours the extreme variation over the intermediate
Seed cracker finch
Can lead to speciation
Directional selection
Occurs when selection favours one particular variation
Ex. Peppered moth
Sexual Selection
Selects for an organism’s ability to obtain a mate and reproduce
Can create structures and behaviours that are harmful to an individuals’ survival
Ex. Peacock tail: attracts females but predators too
Intrasexual
Competition with one sex: attention of females,