Scientist
Who came up with the theory of Evolution
Darwin
How long does natural selection take
long time
see change over time
the type of selection that favors 1 phenotype
directional
A population of grasshoppers in the Kansas prairie has two color traits, green and brown. Typically, the prairie receives adequate water to maintain healthy, green grass. Assume a bird that eats grasshoppers moves into the prairie. How will this affect the population
mostly green
Name 1 of Darwin's 4 factors
struggle, overproduction, variation, advantage
Can individuals change their traits
no but populations can
How do homologous structures provide evidence of evolution
same structure different function show change to suit environment
type of selection that favors both extreme phenotypes hurting the heterozygotes
disruptive
A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. A squirrel can break open the acorns if they are 2cm or smaller. What would you expect the most common circumference(s) to be after 10 generations?
larger than 2cm
Name 1 organism Darwin observed in Galapagos to help him develop his theory
tortoise, finches, etc
in Natural selection what determines if a trait is a benefit or disadvantage?
nature!
How do vestigial structures provide evidence for evolution
why grow something we dont need/use, leftover
the type of selection that favors the heterozygotes, hurting the extremes
stabilizing
There are 2 types of worms: worms that eat at night (nocturnal) and worms that eat during the day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal worms. The nocturnal worms are in their burrows during this time. Each spring when the worms reproduce, they have about 500 babies but only 100 of these 500 ever become old enough to reproduce.
nocturnal
What was the name of the book Darwin wrote
Origin of Species
if they meet the 4 factors!
How can DNA provide evidence of evolution
similar DNA show relatedness
type of selection when favorable traits are bred and chosen by others
artificial
In ostriches, there are 2 types: ones that run fast and those that run slowly. The fast birds can reach up to 40 miles an hour. Jackals love to eat ostrich, and they can reach speeds of up to 35-40 miles per hour. A flock of ostrich will lay ~ 10 eggs (each mother only lays 1), but many rodents break into the eggs and eat the fetus before they hatch.
faster
Darwin is credited with the theory of evolution, who was the other scientist that we discussed in class as well.
jean baptist lammark
Define Natural Selection
the fact that population will change over time to consist of traits suited for the current environment in which they live
What is 1 piece of evidence scientist have to support the theory of evolution
fossils, homologous structures, vestigial structures, DNA, observations, bacteria, ETC
Provide 1 example of artificial selection
many answers
There are two types of rabbits: those that strictly eat grass and those that strictly eat berries and flowers. A drought occurs one year, and the plants have difficulty producing any extras (flowers, berries, etc.).
They can only try and keep themselves green. The rabbits have had babies all year long but many are eaten by foxes or hawks Due to the drought, many have starved to death.
grass eaters