evolution
What did Darwin observe about finches on Galapagos islands ?
this is the study of fossils
paleontology
population favoring intermediate phenotype is underdergoing this type of selection
stabilizing
3 periods of mesozoic era
triassic jurassic cretaceous
earliest vertebrates
jawless fish (hagfish and lamprey)
differences in physical traits are called
variation
genes that no longer function are called
pseudogenes
population where 2 extreme phenotypes are being favored is undergoing this type of selection
disruptive
first living organisms were..
anaerobic prokaryotes
all vertebrates are in phylum...
chordata
traits that are beneficial for an organism in their environment are called...
adaptations
shuffling of alleles during meiosis is called
recombination
two males fighting over a female is this type of sexual selection
intersexual
Cambrian explosion happened in what era?
Paleozoic
four features all chordates share
nototchord, nerve cord, pharyngeal slits, tail
In natural selection, who is the selective agent?
environment
observable change in allele frequency in a population is called
microevolution
increases genetic variation as animals move from one population to another
gene flow
name 3 eras in order of oldest to youngest
Paleozoic, mesozoic, Cenozoic
first tetrapods
amphibians
organisms with common ancestors may have features with similar structures but different functions- these structures are called
homologous
random change in DNA
mutation
divergence of 2 or more species from one is called
speciation
list order of talons for Linnean taxonomy
k, p, c, o, f, g, s
list amniotes and share their unique features
reptiles (ectotherms, laid eggs on land, covered in scales, Jacobsen's organ, 3 ch heart)
Aves (endotherm, feathers, hollow bones, unique sternum, airsac)
mammals (hair, mammary glands, 3 middle ear bones)