Final answer:
The heritability estimate for the personality trait with a correlation of .75 in identical twins and .25 in fraternal twins is approximately 1.00.
Step-by-step explanation:
The heritability estimate can be calculated by doubling the difference between the correlation of identical twins and the correlation of fraternal twins. In this case, the correlation for the personality trait in identical twins is 0.75 and the correlation for fraternal twins is 0.25. Therefore, the difference is 0.75 - 0.25 = 0.50. Doubling this difference gives us a heritability estimate of approximately 1.00.
The heritability estimate of a personality trait can be calculated by comparing the correlations of that trait in identical twins (who share nearly 100% of their genes) with the correlation in fraternal twins (who share about 50% of their genes). If the correlation for the trait in identical twins is .75 and in fraternal twins it is .25, the heritability can be estimated using the formula: 2 * (correlation in identical twins - correlation in fraternal twins). Therefore, the heritability estimate would be approximately 2 * (.75 - .25) = 1.00.