The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair. They determine the biological sex, reproductive organs, and sexual characteristics that develop in a person.

Why are the human sex chromosomes called “X” and “Y,” while the other 22 chromosomes are identified only by numbers? The answer begins in the late 1800s, when insect gonad cells, whose large ...

Players will finally be returning to the Kalos region sometime this year, so there has never been a better time to replay Pokémon X and Y.

Tesla’s Model Y now starts at $42,990 for the rear-wheel drive base model, $47,990 for the Model Y Long Range or $51,490 for ...