C4 & C5 (Microevolution and Speciation) Flashcards
Simply put as the evolution on a small
scale within a single population
microevolution
It is the generation to generation
change in frequencies of alleles within a
population
microevolution
Frequency of alleles in a
population stays the same
generation after generation
unless acted upon by some
outside force.
HARDY WEINBERG THEORY
A ____is often defined as a group of individuals that actually or potentially
interbreed in nature
species
In this sense, a _____is the biggest gene pool possible under natural
conditions
species
Explain and correct the misconception about species:
clue: Species are distinct natural entities, with a clear definition, that can be easily recognized by
anyone.
Good job
a lineage splitting event that produces two
or more separate species
speciation
In ______, an ancestral species splits into
two or more descendant species that are
genetically different from one another and
can no longer interbreed.
speciation
Different species are unable to interbreed and produce healthy, fertile offspring due to barriers called
mechanisms of reproductive isolation
enumerate the prezygotic barriers
*
Geographical Isolation
*
Temporal Isolation
*
Behavioral Isolation
*
Gametic Isolation
*
Mechanical Isolation
enumerate the postzygotic barriers
*
Mixed set of chromosomes
*
Unhealthy individual
*
Infertility
Populations are prevented from
interbreeding by habitat isolation.
Geographical Isolation
Populations are prevented
from interbreeding by the
difference in their mating or
reproduction time
Temporal Isolation
*
Two species might have
different courtship behaviors
or mate preferences and thus
find each other
“
Behavioral Isolation
*
Two species might produce
egg and sperm cells that
can’t combine in
fertilization, even if they
meet up through mating.
Gametic
Isolation
*
