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K-Ar: Potassium-argon
dating technique.
karstic caves: Caves
formed in limestone by the action of water.
karyotype: A complete
set of all the metaphase chromatid pairs in a cell (literally, "nucleus
type").
kinetochore: See centromere.
kin selection: Differential
aid or favoritism toward relatives that promote the inclusive fitness
of shared genes.
kinship: Relationships
between people that are based on real or imagined descent or (sometimes)
marriage.
Klinefelter syndrome:
A human clinical syndrome that results from disomy for the X chromosome
in a male, which results in a 47,XXX male. Many of the affected
males are mentally deficient, have underdeveloped testes, and are
taller than average.
knuckle-walking: A
type of quadrupedal walking used by chimpanzees or gorillas, in
which the forearms rest on the dorsal surface of the middle phalanges
of the hands.
kyphosis: (1) Dorsally
covex curvature of the spine. (2) Flexion of the cranial base, closing
the angle between the basi-occiput and the body of the sphenoid.
kyr: Kiloyears, a unit
of thousands of years (100,000 years is 100 kyr).
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