unit 6 test
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molecular record paragraph
Molecular record compares the amino acid sequences of organisms and displays them on a phylogenic tree which shows how closely organisms are related and shows the organisms more recent common ancestors based off of how closely they are displayed. The closer they are the more DNA they share. This supports evolution bc it shows how different organisms can still share the same traits.
peppered moths paragraph
the variation is color and they can either be white or dark. They are competing to stay alive by blending in with the trees and not get eaten by predators. The dark colored moths have the more advantageous traits bc after the industrial revolution, the trees and air became dark and smoky making it easier for the dark moths to blend in and not get eaten by predators. The fitness is theater the months need to be able to survive in the immediate environment which is the dark trees, so in this case the dark moths are fit to survive while the white moths are not. The dark moths are able to survive longer than the white moths, allowing them to reproduce more, passing their advantageous traits down to their offspring. Overtime, the dark moths will reproduce more than the white moths causing the gene for the dark colored body to be more common bc they’re surviving longer.
what’s the big continent or land mass that moved overtime
pangaea
what’s genetic drift
changes in populations due to chance rather than selection
what’s co-evolution
change of 2 or more species in close association
sexual selection/survival of the sexiest give an example what’s its role
choosing of mates based on traits resulting in an increase of frequency. example is male puffer fish making crop circles to attract mates. Its role is to increase traits that improve mating and reproduction
founder effect
when a group of individuals colonize a new area their genetic makeup is different from the original population
what’s predator-prey
form of co-evolution occurs between the hunter and the hunted where each evolves in response to each other
bottleneck
random events or natural disasters that destroys most of a population
whats population
group of organisms living in the same area
what’s species
population of organisms who can interbreed and produce viable fertile offspring
what’s speciation
formation of a new species
in order for a new species to form populations must be split into 2 or more group. this is called what
isolation
once split apart, small groups from the same population may accumulate new ______ or changes
mutations
overtime, through ________________ will result in favorable traits to become more common in a group.
natural selection
temporal selection or isolation
population different in periods of activity or reproductive cycles .
reproductive isolation
separated by behaviors or characteristics.
geographical isolation
separated by a physical barrier
what does a phylogenic tree show
a recent common ancestor
whats a fossil
dug up remains of an organism
how does fossil evidence provide evidence for evolution
it shows the similarities in the shared bone structures between different animals
how do archeologists date a fossil
though fossil dating which measures the decay of radioactive isotope in fossils
what a homologous structure and an example
similar features originating from a shared common ancestor. example is that all animals have a humerus
how do homologous structures show evidence for evolutionm
bc different animals have similar body parts from the same ancestor.