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Worksheet+13+-+Answer+Key - Bio 93 Worksheet 13 Lecture 25...

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Bio 93 Pooja Patel Worksheet 13 – Lecture 25 and 26 patelph@uci.edu Lecture 25 and 26: Vertebrate Development Stages in Embryonic Development o Fertilization: fusion of sperm and egg nuclei and cell activation Purpose: to bring haploid nuclei of sperm and egg together to form diploid zygote Problems: o Fertilization by sperm from another species o Fertilization by more than one sperm Solutions o Acrosomal reaction: Necessary for sperm to penetrate into egg Triggered by binding of receptors on sperm surface to those on egg o Cortical reaction Started when sperm and egg fuse Prevents additional sperm penetration and starts metabolic reactions that initiate embryonic development Rise in Ca 2+ in egg’s cytosol o Cleavage: rapid cell division without growth in size to generate a multicellular embryo Divide cytoplasm of zygote into many smaller cells called blastomeres Influenced by amount of yolk in eggs (influences gastrulation) Blastula is formed: clump of cells with blastocoel (fluid filled space)
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This note was uploaded on 12/13/2011 for the course BIOSCI 93 taught by Professor Staff during the Fall '11 term at UC Irvine.

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Worksheet+13+-+Answer+Key - Bio 93 Worksheet 13 Lecture 25...

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