a group of four; four pollen grains remaining fused together at maturity, e.g. in Ericaceae, Epacridaceae.
Paired, duplicated chromosomes visible at the start of meiosis I.
Gk. tetras, four] In genetics, a pair of homologous chromosomes that have replicated and come together in prophase I of meiosis; consists of four chromatids.
a means of examining the effects of a media on society by dividing its effects into four categories and displaying them simultaneously
an item format which groups items into sets of four
The four homologous chromatids that associate during prophase and metaphase of meiosis and are involved in crossing over. A tetrad is also the four haploid cells produced by one complete meiotic division.
A tool for exploring the impact of any new technology. It consists of a system of four questions you should ask of each such technology (Marshall & Eric McLuhan).
The four chromatids in each cluster during synapsis; formed by the two sister chromatids in each of the two homologous chromosomes.
1. The four cells arising from the second meiotic division in plants (pollen tetrads) or fungi (ascospores). 2. The quadruple group of chromatids that is formed by the association of duplicated homologous chromosomes during synapsis in meiosis I. a.k.a. quadrivalent.
A group of four pollen grains or spores.
The four products of a single meiosis.
four homologous chromatids (two in each chromosome of a bivalent) synapsed during first meiotic prophase and metaphase
(1) Four homologous chromatids in a bundle in the first meiotic prophase and metaphase. (2) The four haploid product cells from a single meiosis.
( TEHT-RAHD ) A MULTI - ARENE RING MOLECULE,THAT IS MADE OF FOUR CARBON ATOM, SQUARE SHAPED, ARENE RINGS. ( TETRA = FOUR ) OUR LIGAMENTS ARE MADE OF LONG TETRAD MOLECULES.
The tetrad or number four is the first number formed by the addition and multiplication of equals. To the this symbol and number represented justice as it is the first number that is divisible every way into equal parts.