Parental-ditype (PD)

Parental-ditype (PD)

One of three types of tetrads possible when two genes are segregating in a cross. The PD tetrad contains four nuclei, all of which are parental genotypes, with two of one parent and two of the other parent.

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Part of Speech: noun
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Industry/Domain: Archaeology
Category: Human evolution
Company: ArchaeologyInfo.com
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parental-ditype (PD)

Archaeology; Human evolution

One of three types of tetrads possible when two genes are segregating in a cross. The PD tetrad contains four nuclei, all of which are parental genotypes, with two of one parent ...

parental ditype (PD)

Biology; Biochemistry; Molecular biology

A tetrad type containing two different genotypes, both of which are parental. A spore arrangement in Ascomycetes that contains only the two non-recombinant -type asco spore s.

PD

Animals; Crustaceans

The junction between the propodus and the dactylus.

interstitial wear

Archaeology; Human evolution

See interproximal wear.

one gene-one enzyme hypothesis

Archaeology; Human evolution

The hypothesis, based on Beadle and Tatum's studies in biochemical genetics, that each gene controls the synthesis of one enzyme.

formation processes

Archaeology; Human evolution

Those processes affecting the way in which archaeological materials came to be buried, and theirsubsequent history afterwards. Cultural formation processes include the deliberate ...

subspecies

Archaeology; Human evolution

A geographically defined aggregate of local populations which differs with various degrees of significance (depending on the author) from other such subdivisions of the species.

variance

Archaeology; Human evolution

A statistical measure of how values vary from the mean. See also standard deviation.

euchromatin

Archaeology; Human evolution

Chromatin that is condensed during division but becomes uncoiled during interphase.

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