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Most attempts to explain this discrepancy have focused primarily on behavior, some of which are almost certainly valid. Higher rates of tobacco consumption, a reluctance to seek proper and timely medical care and even lower rates of hand-washing absolutely do play a role in who will be hit hardest. Rather, it may be a timely and high-profile demonstration of what up until recently has been an underappreciated scientific fact: When it comes to survival, men are the weaker sex. This innate biological advantage is apparent at every age and stage of human life: Baby girls are consistently more likely to make it to their first birthday; 80 percent of all centenarians today are women; an incredible 95 percent of those who reach the formidable age of years old are women. While on average genetic males have more muscle mass and greater height, overall size, and physical strength, when it comes to surviving the physical hardships encountered from birth to late-in-life, genetic females almost always outlast genetic males. We have long assumed that the only reason behind the earlier and disproportionate demise of men was behavioral.
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Gender and Genetics

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Y chromosome - Genetics Home Reference - NIH

This page has been archived and is no longer updated. Whether an animal will become a male, a female, or a hermaphrodite is determined very early in development. Scientists have worked for hundreds of years to understand the sex-determination system. For instance, in B. If the male's heat could overwhelm the female's coldness, then a male child would form.
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Beyond XX and XY: The Extraordinary Complexity of Sex Determination

Arthur P. The brains of males and females differ, not only in regions specialized for reproduction, but also in other regions controlling cognition, for example where sex differences are not necessarily expected. Moreover, males and females are differentially susceptible to neurological and psychiatric disease. What are the origins of these sex differences?
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The X chromosome is one of the two sex chromosomes in humans the other is the Y chromosome. The sex chromosomes form one of the 23 pairs of human chromosomes in each cell. The X chromosome spans about million DNA building blocks base pairs and represents approximately 5 percent of the total DNA in cells. Each person normally has one pair of sex chromosomes in each cell.
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