ENVS 212 - Exam 2 Questions with Correct Answers
What is a cline? Correct Answer-a smooth transition in a trait across geographical space
What is an example of cline? Correct Answer-a species having greater cold tolerance in the colder parts of its range than in the warmer parts of its range
What is Bergmann's Rule? Correct Answer-Body sizes of mammals and birds increase with distance FROM the equator
What is Bergmann's Rule and example of? Correct Answer-A cline!
When do clines evolve? (2) Correct Answer-- When selection pressures change across space
- When there is gene flow between populations
What is Gene Flow? Correct Answer-The mixing of alleles between different populations
What are the 2 important roles of gene flow in evolution? Correct Answer-- Equalizes allele frequencies and erodes genetic differences between populations
- Introduces new alleles into populations where they already exist What causes gene flow? Correct Answer-Dispersal of either gametes or individuals
True or false: Not all migration results in gene flow Correct Answer-
True
What equation "measures migration"? Correct Answer-∆p = m (pm - p)
Define the variables in the equation:
∆p = m (pm - p) Correct Answer-- ∆p is the change in allele frequency due to migration
- m is how quickly gene flow eliminates genetic differences between populations
- pm is allele frequency in migrants
- p is allele frequency in recipient population
When can we and can we not use the equation ∆p = m (pm - p)? Correct Answer-When there are no distinct populations due to spatial continuity
What is this formula measuring?
∆p = m (pm - p) Correct Answer-Migration rate
What is a cline? Correct Answer-a smooth transition in a trait across geographical space
What is an example of cline? Correct Answer-a species having greater cold tolerance in the colder parts of its range than in the warmer parts of its range
What is Bergmann's Rule? Correct Answer-Body sizes of mammals and birds increase with distance FROM the equator
What is Bergmann's Rule and example of? Correct Answer-A cline!
When do clines evolve? (2) Correct Answer-- When selection pressures change across space
- When there is gene flow between populations
What is Gene Flow? Correct Answer-The mixing of alleles between different populations
What are the 2 important roles of gene flow in evolution? Correct Answer-- Equalizes allele frequencies and erodes genetic differences between populations
- Introduces new alleles into populations where they already exist What causes gene flow? Correct Answer-Dispersal of either gametes or individuals
True or false: Not all migration results in gene flow Correct Answer-
True
What equation "measures migration"? Correct Answer-∆p = m (pm - p)
Define the variables in the equation:
∆p = m (pm - p) Correct Answer-- ∆p is the change in allele frequency due to migration
- m is how quickly gene flow eliminates genetic differences between populations
- pm is allele frequency in migrants
- p is allele frequency in recipient population
When can we and can we not use the equation ∆p = m (pm - p)? Correct Answer-When there are no distinct populations due to spatial continuity
What is this formula measuring?
∆p = m (pm - p) Correct Answer-Migration rate
