haplo-, hapl-

(Greek: simple, simply; single, one, once)

The haploid stage of a life cycle.
A single neossoptile, without rachis (shaft of a feather), formed by precocious development of the barbs of the teleoptile.
An instrument that presents two separate views to the eyes so both of the views may be seen as one integrated view.

It is used to measure, to test, or to stimulate various binocular functions.

A reference to an instrument that presents separate views to each eye so that they may be seen as one integrated view.
haploscopic vision
The perception of two separate images, presented separately to the eyes by a stereoscopic device.
The use of an instrument in the laboratory to study various aspects of binocular vision.

It presents separate fields of view to the two eyes while allowing changes in convergence or accommodation of one or both eyes, as well as providing for controls of color, and the intensity or size of the target and field.

haplozygous, hemizygous
1. Having only one of a pair of genes; for example, an unpaired X chromosome in males.
2. Referring to a single copy of a gene instead of the customary two copies.

All of the genes on the single X chromosome in the male are in the hemizygous state.