BIOL 201 Lecture Notes - Lecture 1: Sporophyll, Microsporangia, Microspore
Document Summary
Pollen plays an important role in pine reproduction. Pollen cone consists of many small scale-like pods arranged in numerous files each scale is called a sporophyll. On the under side of the sporophyll, there are two microsporangia. An outer epidermis covers the sporophyll and its sporangia. The tapetum is a layer of cells that is located under the sub-epidermis layer o. Inside the tapetum, there is massive spore producing cells called. It contributes to the development of the pollen grains microsporocytes from each parent) Nucleus of microsporocyte cell is diploid (2 sets of chromosomes, one o. As each sprorocyte prepares to divide, it deposits a layer of inert callose o. Nucleus inside each sporocyte divides by meiosis producing 4 haploid callose separates the microsporocytes from one another daughter nuclei dome portion. Each nucleus is then surrounded by a wall which enlarges 2 points, resulting in microspore cells that remain attached called a tetrad.
