Words similar to xo

Example sentences for: xo

How can you use “xo” in a sentence? Here are some example sentences to help you improve your vocabulary:

In mammals and invertebrates, diploid animals of genotype Xo and XXY were crucial in establishing that doses of X confer femininity in invertebrates and that presence of Y confers masculinity in mammals.
Nearly all mammals have the XX female and XY male system, with XXY individuals being male and Xo individuals female.