workshop 5 - Workshop on Alternation of Generations by Dana...

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Workshop on Alternation of Generations by Dana Krempels Introduction For students new to the study of Kingdom Plantae, the life cycle of plants--in which a diploid generation alternates with a haploid generation--can be difficult to understand. The purpose of this workshop is to allow the student to better relate to the phenomenon of Alternation of Generations by (1) examining the details of plant gametophyte and sporophyte structure and function, and (2) creating an animal analog to this type of life history. In today's workshop, your goals will be to 1. Understand the alternation of haploid and diploid individuals in the plant life cycle. 2. Understand the terminology used to describe parts of the life cycle, and recognize what each life cycle stage looks like in the major plant taxa. 3. Acquire a more "personal" understanding of how the alternation of generations works by designing an imaginary animal that goes through this type of life cycle. I. Alternation of Generations in Plants: Processes and Terminology The painful part comes first: knowing the general course of events, and what each life cycle stage and structure is called. A. An Overview of Alternation of Generations The plant life cycle, unlike that of animals, consists of alternating generations of individual organisms that are haploid (the gametophyte ) and diploid (the sporophyte ). Specialized diploid cells in the sporophyte undergo meiosis to produce haploid spores (hence the name "sporophyte"). Each spore grows mitotically to become the new gametophyte, which then produces gametes (hence, the name "gametophyte") which fuse to form a zygote . This grows into the sporophyte, and the cycle continues, as shown in the diagram below. In the diagram 1. Indicate the ploidy (n for haploid, 2n for diploid) of each life cycle stage or structure. 2. Over each of the five arrows, indicate which of the following processes is taking place: mitosis meiosis fertilization
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B. Terminology Part of learning a new subject is learning its vocabulary and terminology. So here we go! 1.
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workshop 5 - Workshop on Alternation of Generations by Dana...

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