Y chromosome

noun Genetics.

a sex chromosome of humans and most mammals that is present only in males and is paired with an X chromosome.

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Origin:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Y chromosome is always a great word to know.

So is ninnyhammer. Does it mean:

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

a fool or simpleton; ninny.

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WordNet

y chromosome
noun
the sex chromosome that is carried by men; "human males normally have one X chromosome and one Y chromosome"

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Matching Quote

"We become male automatically because of the Y chromosome and the little magic peanut, but if we are to become men we need the help of other men—we need our fathers to model for us and then to anoint us, we need our buddies to share the coming-of-age rituals with us and to let us join the team of men, and we need myths of heroes to inspire us and to show us the way."

-Frank Pittman