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Evolutionary puzzle: Why do fraternal twins exist?

The chances of having fraternal twins changes with maternal age and is heritable ...
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Short or tall? Genes account for 79% of height differences, study shows

Since the human genome was sequenced nearly two decades ago, researchers have struggled to fully identify the genetic factors responsible [for ...
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Genes and giraffes: What do those spots tell us?

Giraffes' spotty exterior provides more than camouflage ...
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Tracing the impact of genetics on autism

Autism is more heritable than anorexia, alcohol dependence, depression and obsessive-compulsive disorder, according to an analysis of data from nearly ...