01:119:116 Lecture Notes - Lecture 9: Pollen Tube, Megaspore, Microspore

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

Document Summary

2/14/17: derived traits of seed plants, adaptations for land. Advantage of seeds = protects the embryo: protection, lifespan, food source (baby in a bag with its lunch, reduced gametophyte. Microspores -> males: ovules and egg production. Female gametophyte develops from megaspore -> produces eggs: pollen and sperm production. Pollination = male pollen to female part of plant. Megasporocyte undergoes meiosis -> haploid cell is the megaspore. Fertilization more than 1 year later: gymnosperm diversity. 380 mya 1st seed plants (amniotic egg developed about 320 mya) Four extant phyla (you are not responsible for these: cycadophyta most endangered of all plant species, ginkgophyta- ginkgo biloba, gnetophyta, coniferophyta. Incomplete flower lacks one or more of the organs. Dispersal get away from parent: angiosperm life cycle. As seeds develop from ovules after fertilization, ovary wall thickens and ovary matures into fruit. Protect seeds (embryo: 3 megaspores disintegrate, 1 functional megaspore undergoes 3 mitotic division 1->2->4->8 haploid nuclei.