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: [[Female]] [[human]]s have a pair of [[X Chromosome]]s.
: [[Male]] [[human]]s have an [[X Chromosome]] and a [[Y Chromosome]]s.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f160 ''Chromosome, Y, pages 242, 251, GCSE Biology; Student Book, Collins, AQA '']