BIOMG 1350 Lecture Notes - Lecture 16: Gastrulation, Germ Cell, Ectoderm
31 Oct 2016
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Document Summary
What is included in the study of developmental biology: embryology, metamorphosis, juvenile growth. Adolescents reaching sexual maturity: regeneration, wound healing, tissue homeostasis, reproduction. How does it work: medical relevance. How do we study development: descriptive embryology. Mutating genes in embryos to identify which ones are important. Conjoined: eggs that are outside body, small organisms=best for experimentation. Developmental genetics: the study of mutants, drosophila flies. Similar mechanisms promote development of all animals. Up to 50% of genes in worms, flies, or fish are also present in humans and carry out similar functions: you can substitute genes from other animals into animals that lack the genes. Major events of embryonic development (embryogenesis: fertilization. 23 (egg) + 23 (sperm)=fertilization zygote (2n=46, 23 pairs) Reductional division: separation of homologs in meiosis i. Equational division: separation of sisters in meiosis ii. Initiates embryogenesis by activating the egg: cleavage. M phase s phase m phase : no g1 or g2 phase.
