Download Homologous Structures

Word Bank
Biological fitness
directional selection
Homologous structures Alfred Wallace
Adaptive radiation
Charles Darwin
Convergent evolution
Lamarck
Vestigial structures
coevolution
Disruptive selection
gene pool
Stabilizing selection
population
species
WHO’S THEORY?
EXPLAIN IT
WHO’S THEORY?
EXPLAIN IT.
Who is he and what does he have
in common with Darwin?
What is this?
• Structures that have different
mature forms in different
organisms but develop from the
same embryonic tissues.
A kind of evolution wherein organisms evolve structures
that have similar (analogous) structures or functions in spite
of their evolutionary ancestors being very dissimilar or
unrelated.
What term is illustrated here?
•Mutual evolutionary influence between two species
•Typically evolution of two species totally dependent on each other.
•Exert selective pressure on the other, so they evolve together.
•Extreme example of mutualism.
What word
works best here?
• A group of
individuals of the
same species living
in the same place at
the same time.
Biological definition of a ______
• A group of
populations whose
members are
capable of
interbreeding and
producing fertile
offspring.
Example of a ____________.
 Total collection of
genes in a
population at any
one time.
Sources of Genetic _________
• Mutations
• Gene Shuffling
• Crossing over
• Sexual reproduction
• When individuals at one end of the curve have
higher fitness than individuals in the middle or at
the other end.
• When individuals at the upper and lower ends
of the curve have higher fitness than
individuals near the middle.
• Takes place when
individuals near the
center of a curve have
higher fitness than
individuals at either
end
The ________________________principle states:
Both allele and genotype frequencies in a population
remain constant or are in equilibrium from
generation to generation unless…
Disturbing influences happen such as non-random
mating, mutations, selection, limited population size,
random genetic drift and gene flow.
Genetic equilibrium is a basic principle of
population genetics.
Write out the equation
HW Problem
In Drosophilia, the allele for normal length wings is
dominant over the allele for vestigial wings. In a
population of 1,000 individuals, 360 show recessive
phenotype. How many individuals would you
expect to be homozygous dominant and
heterozygous for this trait?