BIOL 2P93 Lecture Notes - Lecture 1: Zygote, Protoplast, Plasmogamy
17 May 2016
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Document Summary
Takes place in some fungi and some primitive algae. Process of zygotic meiosis: begin with haploid cells that undergo mitosis to produce gametes. Wall breaks, and gametes are released (+/- strain) Induced by nitrogen starvation: +/- gametes are aggregating in clumps where pairs begin to form (positive fuse with negative) Initially sticks together by their flagellar membrane, and later by a protoplasmic thread or conjugation tube. Conjugation tube connects positive and negative gametic pairs at the base of their flagellum. When connection forms, one or both pairs of flagella will propel (partially fused +/- gametes: +/- gametes shed their cell wall and undergoes plasmogamy (protoplast of 2 gametes) fusion of internal contents except for dna. 2 pairs of flagella present: karyogamy occurs soon after plasmogamy fusion of the nuclei, formed a diploid zygote. Can divide asexually or can mate with another strain to produce another cell of diploid zygote.
