Download What is disruptive selection?

What is allopatric speciation?
What is the bottleneck effect?
Speciation that occurs due to
physical or geographical isolation
When a catastrophic event or a
period of adverse conditions
drastically reduces the size of a
population
What is disruptive selection?
What is directional selection?
A form of selection that operates in
favour of extremes and against
intermediate forms
A form of selection that selects
against one of two extremes and
leads to a change in a trait over time
What is the founder effect?
What is meant by gene flow?
A type of gene flow that occurs when The transfer of alleles that results
a few individuals that have become
from emigration and immigration of
isolated from a larger population do
individuals between populations
not carry all the alleles that ere
present in the original population
What is genetic drift?
A change in the gene pool of a
population as a result of chance:
usually occurs in small populations
What does the term isolating
mechanism mean?
A mechanism that prevents
organisms from mating or producing
viable offspring
What does the word immutable
mean?
Unchanging, the idea that species
did not change over time
What is macroevolution?
The evolution of new groups of
organisms comprising many related
species through multiple speciation
events, includes adaptive radiations
What is microevolution?
Any changes in the gene pool of a
single population over a short time
What is the morphological species
concept?
A way of defining a species using
measurable anatomical criteria and
characteristics
Define natural selection
What is a phylogenic tree?
The process where individuals with
certain inheritable traits survive and
reproduce more successfully than
other individuals, leading to
evolutionary change in the
population
What is meant by a postreproductive isolating
mechanism?
A branching diagram showing the
evolutionary relationships between
species: groups joined together in
the tree are believed to have
descended from a common ancestor
A mechanism that prevents
fertilization occurring or an embryo
developing into viable offspring if
fertilization does occur.
What are selection pressures?
A mechanism that prevents
organisms from being able to interact
to reproduce
Factors that influence the survival of
an individual within a population
The situation where males and
females have different morphologies
often in shape and size
What is speciation?
Define sympatric speciation
The evolution of one or more new
species from a ancestral species
Speciation that occurs without
physical or geographical isolation
What is meant by a rereproductive isolating
mechanism?
What is sexual dimorphism?
What does the term wildlife
corridor mean?
What is stabilizing selection?
Natural selection that tends to
A small area of preserved wilderness advantage organisms similar to their
designed to connect larger reserves; parents; this usually occurs when the
also known as a habitat or green
environment is very stable and
corridor
unchanging and selects against
extremes of phenotype
Define DNA fingerprinting
What is a niche?
Also known as DNA profiling. It is
based on patterns of non-coding,
repeating base sequences in the
genome.
An organism’s habitat; or a way of
life or function of an organism in its
environment