Quiz_0 - Reviewofattempt1 Sunday, 27 September 2009, 06:26...

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Review of attempt 1 Started on Sunday, 27 September 2009, 06:26 PM Completed on Sunday, 27 September 2009, 06:42 PM Time taken 16 mins 28 secs Grade 9 out of a maximum of 10 ( 90 %) Question 1 Marks: 1 Flexible Brains People who grow up left-handed have a different, more flexible brain structure than those born to take life by the right hand, says UCLA researchers who use twins to study heredity. The reason is that right-handers have genes that force their brains into slightly more one- sided structure. Left-handers appear to be missing those genes. "There is a real difference in brains that result in a more symmetric brain in left-handers, where the two sides are more equal," said UCLA neurogeneticist Dr. Daniel Geschwind, who lead the research team. "There is more flexibility and that is under genetic control." The hereditary difference between right-handers and left-handers also appears to affect how the brain changes in size throughout a lifetime, researchers found. Of all primates, only humans display such strong predisposition to right-handedness. Right- handers make-up 90% of the population. The left and right halves of the brain are different in both anatomy and their features, related to hand preference. But until now, no one could document the connection. To study brain size and structure, the UCLA researchers used brain-scanning technique called functional magnetic resonance to compare brains in 72 pairs of identical twins, all of them male World War II veterans between the ages 75 and 85. Identical twins- who share the
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This note was uploaded on 06/07/2010 for the course STATISTICS Statistcs taught by Professor Davis,g.g. during the Fall '09 term at UCLA.

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Quiz_0 - Reviewofattempt1 Sunday, 27 September 2009, 06:26...

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