First spermatocyte, condensation of chromatin granules to form tetradsin the linin spireme.
Occasionally one of the tetrads takes the form of a cross (fig.
In the prophase of the spindle, in rare cases, some of the chromosomes are longitudinally split and transversely constricted, forming tetrads (fig.
The tetrads come into the spindle in this form (figs.
In one stage these double U's look much like tetrads (fig.
Shortly before the first maturation division, such split segments as appear in figure 175 are sometimes found; some of these simulate tetradswith slender connecting bands between the paired elements.
Diamond-shaped and contracted cross-shaped tetrads from metaphase of first maturation mitosis, showing linin connections.
This is certainly a reduction division, for the tetrads are always somewhat elongated and come into the spindle with their longer axes parallel with the axis of the spindle.
A few single tetrads of spores are enlarged in fig.
Spores Each spore a single cell which develops with three others in tetrads (groups of four).
In each sporangium large numbers of thesetetrads develop and all the ripe spores seem to have been of one size.
Very numerous tetrads enclosed in a spore case or sporangium which develops on a leaflike segment called the sporophyll.
Other cones had sporangia similar in size and shape, but which produced spores of two kinds, large ones resulting from the ripening of only two or three tetrads in the lower sporangia, and numerous small ones in the sporangia above.
Diplococcus, tetrads short chains and staphylococcus; no sarcina, no flagella.
Origin of the tetradsby ring formation in the spermatogenesis of the mole-cricket (Gryllotalpa) (vom Rath).
In each case the tetrads are formed by the double longitudinal splitting of the chromosomes, the latter appearing in the prophase in the reduced number.
Grouping of the completedtetrads in the equatorial plate of the first maturation division.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tetrads" in a variety of sentences. We hope that you will now be able to make sentences using this word.
