Glossary terms beginning with X

X chromosome

a sex chromosome. Females have two copies of the X chromosome in their genome, males have just one.
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Xanthism

cf. Xanthochromism - colouration of an animal that is unusually yellow.

Xanthochroism

cf. Xanthochromism - colouration of an animal that is unusually yellow.

Xanthochromism

colouration of an animal that is unusually yellow.
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Xenobiosis

several species living together but without sharing the raising of offspring.
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Xiphosura

an Order of marine chelicerates that include the Horseshoe crabs.
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Xylophagous

the behaviour of feeding on wood.
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