What are XX and XY chromosomes?

Answer 1

Chromosomes of humans of course...

#"XX"# and #"XY"# are the sex chromosomes of females and males, respectively. This is the usual case for humans. However, some times, people can get genetic mutations which cause them to have extra chromosomes, with combinations like #"XXY"# or #"XYY"#. That was a short introduction to sex chromosomes.

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Answer 2

Cooper Alexander

XX and XY chromosomes are sex chromosomes. XX typically denotes females, while XY denotes males. These chromosomes determine an individual's biological sex.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.