Ap Bio 1982 Essay

AP Bio 1982:Brendan Ramos In the life cycle of a fern and a florescence prepare, compare and contrast each of the following: A. The gametophyte generation B. sperm transport and fertilization C. conceptus protection A. Small multi carrellular young-begetting(prenominal) and female gametophytes are produced within the flower of the sporophyte in develop plants. The gameteophyte of a fern consists of a free living distinct plant called the prothallus on which organises called archegonia and antheridia produce eggs and spermatozoan respectively. Gametes are produced by both these gametophytes. A. GAMETOPHYTE GENERATION I. FERN * Haploid * Reduced in proportion to sporophyte * Characterized as a heart-shaped prothallus * Eggs formed in archegonia * Sperm formed in antheridia * exposit of archegonial structure * Details of antheridial structure * Gametophyte is photosynthetic; has rhizoids for anchoring and water submergence II.

FLOWERING PLANT * Male (micro)gametophyte (or pollen molecule is immature microgametophyte) * distaff (mega)gametophyte or embryo sac * Structure of microgametophyte commonly 2 cells, a tube and a generative cell (sometimes set as a tube cell and two sperm nuclei) * Structure of megagametophyte is 7 cells with 8 nuclei * Both gametophytes nutritionally symbiotic on the sporophyte * Haploid * Gametophyte develops usually from one type of spore in ferns (homospory), * While in the flowering plnats each gametophyte develops from a dissimilar type * Of spore (heterospory). B. SPERM ! TRANSPORT...If you want to get a nice essay, order it on our website: OrderCustomPaper.com

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