Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 ,^ Fig. 3.—Maturation and fertilization. A, female cell. S, male cell, (o) Oocyte of the first order. {a>) Spermatocyte of the first order, (b) Oocyte of the second order. (6') Spermatocyte of the second order, (c) Egg. (c>) Spermatid, (d) Sperm. (Ip) First, (2p) Second polar body, (e) Egg and sperm. (/) Fertilized egg. That the chromosomes maintain their individuahty (genetic
Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 ,^ Fig. 3.—Maturation and fertilization. A, female cell. S, male cell, (o) Oocyte of the first order. {a>) Spermatocyte of the first order, (b) Oocyte of the second order. (6') Spermatocyte of the second order, (c) Egg. (c>) Spermatid, (d) Sperm. (Ip) First, (2p) Second polar body, (e) Egg and sperm. (/) Fertilized egg. That the chromosomes maintain their individuahty (genetic con- tinuity) throughout the life cycle has long been held by cytologists. In some plants and animals, the chromosome boundaries do not entirely disappear during the resting stage, from which it is evident that the morphological identity of the chromosome is not lost between mitoses. Chromosomes are the carriers of hereditary qualities from parent to offspring. Sex Cells.—During embryonic life the primordial germ or sex cells give rise to numerous cells that migrate into the male or female gonad. The male cells, at this stage known as ''spermatogonia,' after a period of
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