Genes and Behaviour
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Transcript of Genes and Behaviour
Genes and Behaviour
Process EnvironmentalRegulatory genes
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Enzyme production
Enzymes
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Enzyme production
Enzymes
Carbohydrates, fats & proteins
Physical (e.g. temp)
Regulated biochemical reactions
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Enzyme production
Enzymes
Carbohydrates, fats & proteins
Physical (e.g. temp)
Regulated biochemical reactions
Cell metabolism
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Enzyme production
Enzymes
Carbohydrates, fats & proteins
Physical (e.g. temp)
Regulated biochemical reactions
Cell metabolism
Carbohydrates, fats & proteins
Environmental influences (e.g. visual input for the development of the CNS)
Physiological mechanisms
Development of nervous, skeletal & endocrine systems
Process EnvironmentalRegulatory genes
Environmental influencesturn genes on and off
Structural Genes
Enzyme production
Enzymes
Carbohydrates, fats & proteins
Physical (e.g. temp)
Regulated biochemical reactions
Cell metabolism
Carbohydrates, fats & proteins
Environmental influences (e.g. visual input for the development of the CNS)
Physiological mechanisms
Development of nervous, skeletal & endocrine systems
BEHAVIOUR
Environmental influences(e.g. social environment)Sensory perception, CNS processing,Motor generation
INHERITANCE OF
SONG PATTERNS IN CRICKETS(BENTLEY, 1971)
Teleogryllus commodus Teleogryllus oceanicus
X
F1 hybrid
X X
T. oceanicus x F1 backcross
T. commodus x F1 backcross
Quantitative Genetics
1 allele 2 alleles
X allelesFor any trait:
Total variance = genetic variance + environmental variance
Or VT = VG + VE
Heritability = VG + VE
VG
Foulbrood in Honeybees
Under the control of two alleles
Foulbrood in Honeybees
Under the control of two alleles
u - for uncapping U - no uncapping
r - removal R - no removal
Female (uurr)
X
Male (UR)
Non-hygenic
All females - non-hygenic(UuRr)
Hygenic
Foulbrood in Honeybees
Now do various backcrosses F1 females to males
Genotype No uncapping
Uncapping No removal
Removal
U_R_ * *
u_R_ * *
U_r_ * *
u_r_ * *
Artificial Selection - Drosophila geotaxis
Selection of positively and negativelygeotactic Drosophila
Fast maters Control Slow maters
Artificial selection - mating speed in Drosophila
First half of maters
Second half of maters
Repeat for 25 generations
Got three distinct lines
Fast - 3 mins Control - 5 mins Slow - 80 mins
Hybridization Experiments - Lovebirds
Peach-faced Fischer’s
Hybridization experiments - Sokolowski
Path length Path length
Sitter Rover Sitter RoverP1
Path length
Sitter Rover
Path length
Sitter Rover
F1 F1x
E. Parent Offspring Regression
Activity scores with Drosophila
Offspring
Mid-parent score (P1 + P2)2
••
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•
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Slope = heritability
F. Comparative approach - Temperature selection in Peromyscus
Preferred Temperature (Adults)
-5
0
5
10
15
Dunce and rutabaga genes - Drosophila
ATP
Adenylyl cyclase
cAMP cAMP phosphodiesterase
PKA
activates
Binds and activates
Turns on genes that cause changes in structure and function of nerve
cells that govern memory
CREB
What about genes that affect larger collections of behavioural acts?
fosB gene in mice
Brown et al. 1996. A defect in nurturing in mice lacking the immediate early gene fosB. Cell 86: 297 - 309