01:119:116 Lecture Notes - Lecture 9: Plant Cell, Meiosis, Celery

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: Professor Beal

Document Summary

A. male gametophyte: anther contains microsporangia, many microsporocytes (2n), produce microspores (n), pollen grain = two celled male gametophyte, tube cell, generative cell -> divides and forms 2 sperm. B. female gametophyte: ovary has ovules, ovule = megasporagium, megasporocyte undergoes meiosis -> produces 4 haploid megaspore -> 8 haploid nuclei. C. pollination: anther to stigma, ensure cross-pollination, tube grows from tube cell, penetrates through micropyle, discharges two sperm cells into female gametophyte (embryo sac). D. female gametophyte: 6 of the cells contain single nucleus, one egg is egg cell, central cell has 2 nuclei, egg + central cell involved in fertilization. E. double fertilization: sperm fertilizes egg, other sperm fuses with two nuclei in central cell, triploid cell (3n), ovule matures into seed, 3n cell -> endosperm. A. basal angiosperms ~100 extant species in 3 lineages: amborella trichopoda- small shrub on one island of south pacific, water lilies- aquatic habitat worldwide, star anise. B. magnoliids: ~8000 species, examples: magnolia, black pepper plants, and avocados.