BIO1022 Lecture 7: WEEK 7 Animal Development
13 Oct 2018
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Document Summary
- determined by the genome of the zygote and by differences that arise between early embryonic cells. - cell differentiation is the specialisation of cells in their structure and function. - morphogenesis is the process by which an animal takes shape. Important events regulating development occur during fertilisation and each of three successive. Contact of the sperm with the development. (two important reactions: acrosomal reaction & cortical reaction : contact. The sperm cell contacts the egg(cid:495)s jelly coat: acrosomal reaction. Hydrolytic enzymes released from the acrosome make a hole in the jelly coat, while growing actin filaments form the acrosomal process. This structure protrudes from the sperm head and penetrates the jelly coat, binding to receptors in the egg cell membrane that extend through the vitelline layer: contact and fusion of sperm and egg membrane. A hole is made in the vitelline layer, allowing contact and fusion of the gamete plasma membranes.
