Biol 152 Exam 1 – Archibald UPDATED ACTUAL Exam Questions and CORRECT Answers

Biol 152 Exam 1 – Archibald UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Evolution is Change in a population OVER TIME - CORRECT ANSWER - multiple
definitions


- not instantaneous, occurs OVER a period of time
- genetic traits
- NOT always mutation


[T/F] Evolution is NOT instantaneous - CORRECT ANSWER - True. It occurs OVER a
period of time


[T/F] Evolution is NOT always mutation - CORRECT ANSWER - True



What is Biological Evolution? - CORRECT ANSWER - - change in FREQUENCY of
genetic trait


- anything inherited


What is a POPULATION? - CORRECT ANSWER - ALL individuals in a SINGLE
species that live and reproduce in the SAME geographic area ("gene pool")


Genotype - CORRECT ANSWER - not changing frequencies of alleles, but the way the
alleles are combined AA, Aa, aa


How can a population GAIN and LOSE genetic variation?? - CORRECT ANSWER --
Migration (Gene Flow)

, - Decrease in population size/founder effect (Genetic Drift)


- NON-RANDOM MATING


- Mutations + RECOMBINATION


- NATURAL SELECTION/FIXED ALLELES - only allele for that gene


What can GENERATE genetic variation? - CORRECT ANSWER - - Mutation
(random effect; duplication errors)


What else brings new alleles into a population? - CORRECT ANSWER --
Migration/Gene Flow ->> moving into another population


- non-random mating (inbreeding/outbreeding)


Genetic Drift - CORRECT ANSWER - RANDOM CHANGE in FREQUENCY of a
genetic trait in a population


- no effect on BIG populations


- dec variation w/in pop
- inc variation AMONG pop


Gene flow / migration - CORRECT ANSWER - movement of genes from 1 population to
another