NSCI 1403 Study Guide - Midterm Guide: Guanine, Nitrogenous Base, Pyrimidine
9 Jul 2016
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Document Summary
Alternation of generations: universal feature of the life cycle of land plants. The life cycle includes the diploid and haploid stage. Spores are produced by meiosis that develop into multicellular haploid organisms. Through mitosis and cytokinesis, the embryo is formed. The embryo later develops into a sporophyte, which is a multicellular diploid plant. Cells contained within the reproductive organs are called sporangium. Sporangium undergoes meiotic division to produce haploid cells called gametophytes, which are the multicellular haploid plants. Homosporous: single type of spore, with its gametophyte stage containing antheridia and archegonia, and produce flagellated sperm. Heterosporous: produce two spore megaspore that develops into the female gametophyte producing the egg and microspore that develops into the male gametophyte producing the sperm. Mosses: (homosporous) nonvascular plant that lacks tracheid, water instead flows through the hydroid. Gametophyte begins its development following the development of the spore germination. Ferns: (homosporous) vascular plant in which xylem is responsible for water transport.
