Nature, Nurture, and Behaviour. Behavioural Genetics. Genetic contribution to behaviour But also environmental role Interaction Could just as well say BG studies the role of environment on behaviour as that of genetics…. Polygenic Traits.
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Appearance of dwarf and giant varieties All
Piebald coat colour All
Wavy or curly hair Sheep, poodles, donkeys, horses,
pigs, goats, mice, guinea pigs
Rolled tails Dogs, pigs
Shortened tails, fewer vertebrae Dogs, cats, sheep
Floppy ears Dogs, cats, pigs, horses, sheep,
Changes in reproductive cycle All except sheep
11 12 13 14 15 16 17 18 19 4 6 8 10 12
Fear of unknown
Response to sound
Eyes fully open
Window of socialization
Characteristic Domesticated Nondomesticated in frequency
Population Population (percent)
Depigmentation (Star) 12,400 710 +1,646
Brown mottling 450 86 +423
Gray hairs 500 100 +400
Floppy ears 230 170 +35
Short tail 140 2 +6,900
Tail curled up 9,400 830 +1,033Incidence of Change
All sources are twins raised together (sample sizes shown inside bars).