. The eggs of mammals . m ^M Fig. 16. Ovum removed from a ripe follicle of a rabbit doe at two hours after copulation. Note beginning of chromatin condensation. (From the Journal of Experimental Medicine.) Before copulation occurs the mature ovum contains a single large vesicular nucleus about 30 microns in diameter (Figure 15; see also Plate III, Figs. 4 and 5). At two hours after copulation signs of change are partially evident: some of the ripe ova show the beginnings of tetrad formation in the nucleus but the nuclear membrane is still intact (Fig- ure 16). By four hours after copulation th
. The eggs of mammals . m ^M Fig. 16. Ovum removed from a ripe follicle of a rabbit doe at two hours after copulation. Note beginning of chromatin condensation. (From the Journal of Experimental Medicine.) Before copulation occurs the mature ovum contains a single large vesicular nucleus about 30 microns in diameter (Figure 15; see also Plate III, Figs. 4 and 5). At two hours after copulation signs of change are partially evident: some of the ripe ova show the beginnings of tetrad formation in the nucleus but the nuclear membrane is still intact (Fig- ure 16). By four hours after copulation the tetrads of the first polar spindle are formed and the nuclear membrane is ordinarily dissolved (Figure 17). The metaphase plate has a diameter of a little over 10 microns. The first polar
Size: 2136px × 2339px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookco, bookpublishernewyorkthemacmillancompany
