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12.3 Is Personality More Nature or More Nurture? Behavioural and Molecular Genetics – Introduction to Psychology – 1st Canadian Edition
A new edition of this book was published on August 22, 2024. You can find it here: <a href="https://opentextbc.ca/psychologymtdi/">Introduction to Psychology: Moving Towards Diversity and Inclusion</a>.<br><br>This book is designed to help students organize their thinking about psychology at a...
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Table:
| Correlation between children raised together | Correlation between children raised apart | Estimated percent of total due to | |||||
|---|---|---|---|---|---|---|---|
| Identical twins | Fraternal twins | Identical twins | Fraternal twins | Heritability (%) | Shared environment (%) | Nonshared environment (%) | |
| Age of puberty | 45 | 5 | 50 | ||||
| Aggression | 0.43 | 0.14 | 0.46 | 0.06 | |||
| Alzheimer disease | 0.54 | 0.16 | |||||
| Fingerprint patterns | 0.96 | 0.47 | 0.96 | 0.47 | 100 | 0 | 0 |
| General cognitive ability | 56 | 0 | 44 | ||||
| Likelihood of divorce | 0.52 | 0.22 | |||||
| Sexual orientation | 0.52 | 0.22 | 18–39 | 0–17 | 61–66 | ||
| Big Five dimensions | 40–50 |
I don't know what the general consensus is here, but I thought that upbringing during the first 7 years and interactions with peers during years 12-18 were the factors that most effected a person's personality, but this tells a bit of a different story. It is worth reading all of this as you don't get the full picture from just the table, but if you don't have time or enough interest I put in some quotes from the paper below.
Interesting Quotes:
"sexual orientation the estimates of heritability vary from 18% to 39% of the total across studies"
" at first think that parents would have a strong influence on the personalities of their children, but this would be incorrect. As you can see by looking in column 7 of Table 12.6,” research finds that the influence of shared environment (i.e., the effects of parents or other caretakers) plays little or no role in adult personality"
[UWSL]"These nonshared environmental differences are nonsystematic and largely accidental or random, it will be difficult to ever determine exactly what will happen to a child as he or she grows up. Although we do inherit our genes, we do not inherit personality in any fixed sense."[/UWSL]
