Biology 121 Exam 3 Study Guide UPDATED
Exam Questions and CORRECT Answers
Before Charles Darwin what were people's belief on the species found on earth? - CORRECT
ANSWER - Earth was only 6000 years old
Earth and it's organisms would not change
All organisms were created at the same time
What is Natural Selection? - CORRECT ANSWER - The process by which organisms with
certain traits are more likely to survive and reproduce than other organisms.
What were Darwin's observations and that led to competition, natural selection and evolution? -
CORRECT ANSWER - Observed that populations produced more individuals than can
survive.
Does evolution have a goal? - CORRECT ANSWER - No, occurs in response to local
environmental conditions, not future ones.
Does an Individual evolve? Does a population evolve? - CORRECT ANSWER - No; Yes
What is fitness and it's basic measurement? - CORRECT ANSWER - Fitness is a measure
only in terms of the number of healthy offspring produced.
What is Biogeography? - CORRECT ANSWER - The study of the geographic distribution of
species.
What is gene pool? - CORRECT ANSWER - Consists of all versions of all the genes carried
by all the individuals in a population.
, What are the two mechanisms that can change the genetic makeup of a population? - CORRECT
ANSWER - Mutations (Random changes to DNA, new genes)
Sexual recombination (shuffling genes)
In addition to natural selection what four other mechanisms contribute of gene pools and
evolution. - CORRECT ANSWER - Genetic drift
Bottleneck/Founder effect
Gene flow
Sexual selection
What are the 6 reproductive barriers and what do they mean? - CORRECT ANSWER -
Behavioral isolation
Mating time differences
Hybrid weakness
Habitat isolation
Mechanical incompatibility
Gametic incompatibility
What two domains compose the Prokaryotes? - CORRECT ANSWER - Domain Bacteria
Domain Archaea
What is Biogenesis? What was early earth like? - CORRECT ANSWER - The formation of
new living organisms. Early Earth was like, no elements were on earth, no oxygen.
What was most likely the first duplicating molecule? - CORRECT ANSWER - RNA (acts
like an enzyme-makes copies).
What is the time period for different life appearing on earth? - CORRECT ANSWER - Brio
(showed up first)
Ferns
Exam Questions and CORRECT Answers
Before Charles Darwin what were people's belief on the species found on earth? - CORRECT
ANSWER - Earth was only 6000 years old
Earth and it's organisms would not change
All organisms were created at the same time
What is Natural Selection? - CORRECT ANSWER - The process by which organisms with
certain traits are more likely to survive and reproduce than other organisms.
What were Darwin's observations and that led to competition, natural selection and evolution? -
CORRECT ANSWER - Observed that populations produced more individuals than can
survive.
Does evolution have a goal? - CORRECT ANSWER - No, occurs in response to local
environmental conditions, not future ones.
Does an Individual evolve? Does a population evolve? - CORRECT ANSWER - No; Yes
What is fitness and it's basic measurement? - CORRECT ANSWER - Fitness is a measure
only in terms of the number of healthy offspring produced.
What is Biogeography? - CORRECT ANSWER - The study of the geographic distribution of
species.
What is gene pool? - CORRECT ANSWER - Consists of all versions of all the genes carried
by all the individuals in a population.
, What are the two mechanisms that can change the genetic makeup of a population? - CORRECT
ANSWER - Mutations (Random changes to DNA, new genes)
Sexual recombination (shuffling genes)
In addition to natural selection what four other mechanisms contribute of gene pools and
evolution. - CORRECT ANSWER - Genetic drift
Bottleneck/Founder effect
Gene flow
Sexual selection
What are the 6 reproductive barriers and what do they mean? - CORRECT ANSWER -
Behavioral isolation
Mating time differences
Hybrid weakness
Habitat isolation
Mechanical incompatibility
Gametic incompatibility
What two domains compose the Prokaryotes? - CORRECT ANSWER - Domain Bacteria
Domain Archaea
What is Biogenesis? What was early earth like? - CORRECT ANSWER - The formation of
new living organisms. Early Earth was like, no elements were on earth, no oxygen.
What was most likely the first duplicating molecule? - CORRECT ANSWER - RNA (acts
like an enzyme-makes copies).
What is the time period for different life appearing on earth? - CORRECT ANSWER - Brio
(showed up first)
Ferns
