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Other species including most species use the presence of two X chromosomes to determine femaleness: one X chromosome gives putative maleness, but the presence of Y chromosome genes is required for normal male development.

In animals this is often accompanied by differences, generally through combinations of , , , chromosomes, or.

; Marshall Graves, Jennifer A.

This is the key difference between XX chromosomes and XY chromosome.

from the original on 2012-10-01.

In these species, one or more are present on their that determine maleness.

The X and Y sex chromosomes are different in shape and size from each other, unlike the rest of the chromosomes , and are sometimes called.

Wallis MC, Waters PD, Graves JA June 2008.

That pair is known as.