Practice problem
Sex-Linked Traits — Definition & Examples
By Valeri Natole
+1 contributors
Contributors
By Foxsake uk (Own work) [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons
A cat can have calico fur only if it has two X chromosomes. From this statement, which of the following must be true?