Chromosome map
A diagram of the linear order of the genes on a chromosome.
Chromatophores
A pigment-containing or pigment-producing cell, especially in certain lizards, that by
expansion or contraction can change the color of the skin. Also called pigment cell.
Chytrid
Fungus with flagellated stage; possible evolutionary link between fungi and protists.
Cilium
A short cellular appendage specialized for locomotion, formed from a core of nine outer
doublet microtubules and two inner single microtubules ensheathed in an extension of
plasma membrane.
Circadian rhythms
A physiological cycle of about 24 hours, present in all eukaryotic organisms, that persists
even in the absence of external cues.
Circulation
The flow of blood from the heart through the arteries, and then back through the veins to
the heart, where the cycle is renewed.
Circulatory
Relating to blood circulation or circulatory system.
Cirrus
A slender flexible appendage, such as the fused cilia of certain protozoans.
Cladistics
A taxonomic approach that classifies organisms according to the order in time at which
branches arise along a phylogenetic tree, without considering the degree of morphological
divergence.
Cladogenesis
A pattern of evolutionary change that produces biological diversity by budding one or more
new species from a parent species that continues to exist; also called branching evolution.
Cladogram
A dichotomous phylogenetic tree that branches repeatedly, suggesting a classification of
organisms based on the time sequence in which evolutionary branches arise.
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