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Unit 4 Learning Objectives.docx
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Unit_4_Learning_Objectives.docx-Specific Unit 4 Goals and Outcomes
Page 2
LOCS
A. Recall
that inbreeding depression results in a decline in average fitness.
Homozygotes tend to increase while heterozygotes tend to decrease which means that
recessive alleles will be exposed
B.
Predict
how inbreeding will change genotype and allele frequencies.
Genotype frequencies will change but allele frequencies will not
HOCS
C.
Justify
why inbreeding does not cause evolution directly, yet can speed the rate of
evolutionary change.
It does not cause evolution directly because allele frequencies are not changed which is
the cause of evolution
It can speed up the rate of evolution because it exposes the homozygous recessive alleles
D.
Distinguish
female choice from male-male competition.
Female choice: females will choose what male they want to mate with
Male-male competition: the males will have to compete for who the female will mate
with (males compete for access to females)
9. Understand the processes that reduce (or end) gene flow and therefore facilitate populations
becoming reproductively isolated
LOCS
A. Define
reproductive isolation
No gene flow
Groups cannot reproduce with each other
B.
Restate
(in your own words) the biological species concept using the concept of gene flow
Groups of actually or potentially interbreeding natural populations that are reproductively
isolated from other such groups
o
No gene flow between species because of reproductive isolation
C.
Explain
why gene flow makes speciation by reproductive isolation less likely
If there is gene flow then the groups will be able to reproduce with each other and
wouldn’t be reproductively isolated
Without gene flow, mutation, natural selection, and genetic drift act independently of one
another
D.
Contrast
allopatric and sympatric speciation.
Allopatric: due to a physical barrier
o
Dispersal: small number of individuals leaves and goes somewhere else (use a raft
to go to an island)
o
Vicariance: chance event occurs that changes the landscape
Sympatric: no physical barrier
E.
List
and
define
the 5 types of prezygotic and 2 types of postzygotic barriers to reproduction
Prezygotic:
1.
Habitat: live in different places
2.
Mechanical: doesn’t fit
3.
Gametic: sperm and egg don’t fuse to form zygote
4.
Behavioral: wrong pick up line
5.
Temporal: different mating times
Postzygotic:
1.
Hybrid Infertility: hybrid is sterile
2.
Hybrid Inviability: hybrid does not live
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