Study Guides (380,000)
CA (150,000)
UTSG (10,000)
BIO (400)
Final

BIO220H1 Study Guide - Final Guide: Inbreeding Depression, Inbreeding Avoidance, Litmus


Department
Biology
Course Code
BIO220H1
Professor
John Stinchcombe
Study Guide
Final

This preview shows pages 1-2. to view the full 6 pages of the document.
BIO220
iClicker 5%
January 16 lab 1 cycle start
Lecture 1
Use genetic principles to understand ecological and evolutional aspects
Adaptations of humans
Different DNAs:
mtDNA
chloroplasts
sex chromosomes (X, Y), (Z all, W females)
autosomes
o high/low recombination
crossing over frequency
o low -> all inherited together
o high-> inherited independently because can dissociate from
neighbor on chromosome
different parts of genome have different modes of transmission
uniparental vs biparental
all members of population vs half population
low recombination inherited as a unit
Elephants:
females live with natal group
males are semi-solitary
o join natal groups during mating
Hypothesis: do male elephants avoid inbreeding?
find more resources at oneclass.com
find more resources at oneclass.com

Only pages 1-2 are available for preview. Some parts have been intentionally blurred.

2
o Yes, male elephants have evolved inbreeding avoidance because
inbreeding depression is severe
o Selection has not led to inbreeding avoidance because
inbreeding depression is weak/male reproductive success is so
highly variable
Hoeer, eperiets ith elephats are’t possile eause
gestation and lifespan is too long
o So, can use genetic markers
o Litmus test: do males behave in a way that suggests inbreeding
avoidance
Observe behavior
Quantify mating behavior and assess hether the’re
directed away from kin
Maternity is certainty. Paternity requires genetics
o Possible results: Null) No difference, inbreeding preference,
inbreeding avoidance
o Result: elephants avoid their kin
Also holds for paternal relatives
Inbreeding depression is strong
Wolves
o Observation: some wolf population in Canada migrate while others
do’t
o Do they show genetic differentiation at neutral markers? Are they at
different ecotypes?
o Is there gene flow between migratory and southern resident wolves?
o Measure with molecular tools
o Ecological forces?
o *Taiga= transition between boreal and tundra
o ARE some genetic differences between them, as can be seen
with microsatellite analysis and Fst (1=complete differentiation,
0=no differentiation)
mtDNA: 0.28
Y-chromosomes and autosomes: 0.03
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version