Phylogenetics Flashcards
What is nomenclature?
system of naming things
Nomenclature in biology
Genus species Author
Root in a phylogenetic tree
most distant ancestor
nodes in a phylogenetic tree
speciation event
leaves in a phylogenetic tree
taxa
Allopatric speciation
when a physical barrier separates a community and causes speciation
sympatric speciation
when speciation occus in the same environment
examples of sympatric speciation
polyploidy and pollinator evolution
What is polyploidy?
when a haploid (1n) pollen fuses with a diploid (2n) ovule to produce a triploid offspring which are infertile and inviable
Why does polyploidy lead to sympatric speciation?
polyploidy generates immediate reproductive isolation
What is genetic drift?
change in frequency of a gene due to chance
What is the biological species concept?
a species can interbreed and produce fertile offspring
What is phylogenetic species concept?
a species is the smallest set of organisms that share an ancestor
What is a phylogram?
shows branching patterns, with lengths proportional to amount of evolutionary change
What is a cladogram?
shows branching pattern and order of speciation event