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Embryology
(Gr. embryon, unborn)
The sequence of events in the organism from fertilization to birth
Meiosis creates genetic diversity
→ the choice of maternal or paternal occurs independently and randomly for each pair of homologous chromosomes
Divisions of embryology
General embryology
Special embryology
Meiosis
A special form of nuclear division involved in sexual reproduction
Meoisis vs Mitosis
In vertebrates, only the diploid cells proliferate: the haploid gametes exist only briefly, do not divide at all, and are highly specialized for sexual fusion
Stages of prenatal development
Spermiogenesis (transformation of spermatids into spermatozoids)
The Preembryonic stage
-> The first 2 weeks of development
- Steps:
> cleavage
> implantation
> embryogenisis
- Final outcome → embryo
Specific characteristics of male meiosis
Nondisjunction - homologs fail to separate properly
In case pregnancy occurs
3rd-8th week → embryonic period
(= period of organogenesis)
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