Unit 6 - Darwin Mechs of Evolution

Question 1

How many Darwinian Tenets?

Answer 1

4

Question 2

Tenet 1:

Answer 2

Populations always overproduce, which is why all populations have competition for resources

Question 3

Tenet 2:

Answer 3

Populations will always have variety

Question 4

Tenet 3:

Answer 4

Environment can and does change randomly

Question 5

Tenet 4:

Answer 5

Only some organisms will be able to survive and reproduce in new conditions (survival of the fittest)

Question 6

Malthus

Answer 6

• Contributes idea of iron law of population growth–population growth tends to outpace food production
• foundation of Darwin’s idea of “struggle for existence,” (competition) nature selects individuals through their ability to survive this struggle

Question 7

Lyell

Answer 7

Foundation of Darwin’s belief that as environment changes, so must organisms

Question 8

Wallace

Answer 8

Had same evolutionary ideas as Darwin, got ideas from reading Lyell

Question 9

Lamarck

Answer 9

• Studied inheritance of characteristics in organisms, believed in the idea of “use or disuse”–keeping helpful characteristics and ridding of unhelpful ones.
• He also thought that characteristics can change during an organism’s lifetime, and these two ideas are wrong because different characteristics are inherited through genetics, not use or disuse

Question 10

Neo-Darwinism

Answer 10

-Darwinism + Central Dogma, nature not only selects for certain phenotypes, but for the alleles that code for phenotypes, the genetics
-Populations whose allele frequencies are changing over time are evolving

Question 11

Hardy-Weinberg Equilibrium

Answer 11

If there’s no change in allele frequency, there is no evolution, and allele frequencies should stay the same unless there are outside factors affecting them (which there always is, so this law cannot be obeyed)