LAB REPORT ENVIRONMENTAL CONTROL OF SEX DETERMINATION

LAB REPORT ENVIRONMENTAL CONTROL OF SEX DETERMINATION -...

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John Nguyen BIO114 Section 0006 ENVIRONMENTAL CONTROL OF SEX DETERMINATION INTRODUCTION The C-Fern, also known as Ceratopteris richardii , is a tropical homosporous fern whose life cycle is an alternation of generations that occurs in moist habitats. During the sexual portion of their life cycle, the haploid spores from the sporophyte undergo mitosis to produce either a male gametophyte or a hermaphroditic gametophyte. The male antheridia then produces sperm which fertilizes the egg in the female archegonium where a zygote is then created to start the asexual portion of the life cycle. From the zygote, mitosis occurs to form the embryo and after going through mitosis again, a sporophyte grows out of the gametophyte. Now, the life cycle is done and just repeats itself when the sorus from the leaves of a sporophyte undergoes meiosis to create new spores (Organisms, 2008). Now during our experiment, we centered our observation on the formation of the gametophyte— whether it was male or hermaphroditic. Sexual determination is dependent on two reasons: environmental and chromosomal. Environmental reasons include temperature or parasite invasion and in some species, it
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LAB REPORT ENVIRONMENTAL CONTROL OF SEX DETERMINATION -...

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