BIOL 1F90 Lecture Notes - Lecture 21: Seta, Egg Cell, Herbaceous Plant
1 Apr 2017
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Document Summary
Eukaryotic, primarily photosynthetic organisms that mostly live on land and display many adaptations to life in terrestrial habitats. Most likely evolved from aquatic algal ancestors (eg. , freshwater green algae known as charophyceans) Probably originated from a single common protist ancestor. Ancient relatives of modern-day chara or coleochaete (both are complex charophycean green algae) probably gave rise to the land plants (embryophytes) Plastids are green: main photosynthetic pigment is chlorophyll a, green accessory pigment is chlorophyll b, orange accessory pigment is beta-carotene. Oogonium=eggs antharidia=sperm: flagellate sperm, large, non-motile eggs. Definitions of mitosis= cell that is a certain number of chromosomes that divides into daughter cells with the same number of chromosomes. Meiosis= diploid to haploid, reduction in number of chromosomes, meiosis requires two cell divisions. A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell: not always needed for gamete production.
