Test 2 Flashcards
Zygotic Life Cycle
- 2n zygote> meiosis> Four 1n spores
- spores devel> gametophytes 1n
- gameto produce> gametes 1n +/- types
- gametes fuse> 2n zygote
ie charophyceans
Sporic Life Cycle
- 1n spores mature m/f types
- male gameto = antheridium w sperm
- female gameto = archegonium w egg
- gametos fert> 2n zygote
- gameto devel with sporophyte
- 2n sporophyte matures> produces sorii
- sorii with sporangium, meiosis>
- spores m/f released
ie ferns fiddlehead
(ALT: diploid sporo gen + hapl gameto gen)
gametophyte
produces gametes, which will fert
gametangia
specialized land plant structure that holds gametes
archegonium and antheridium
protective jacket
sporophyte
produces spores, which will mature
sphyte important b/c shelters, matrotrophy, embryotrophy
shared characteristics green algae + plants
chlorophyll a and b
plastids that produce starch
similar cell ultrastructure (pigments/DNA/plasmodesmata)
similar fixation device (holdfast, rhizoids)
charophyceans
a streptophyta, most closely related to land plants,
plasmodesmata
connecting pores between cells
accessory pigments
anything other than chl: carotenoids; fucoxanthin, phycobilin-fluorescence,
phyla of early seedless plants
bryophytes: mosses, liverworts, hornworts
complex vs simple charophyceans
plasmodesmata in complex
complex charo + early plants shared traits
cytokinesis similar
plasmodesmata
sexual repro w small sperm big egg
nucleomorph
captured frag of DNA found in secondary plastids cryptomonads, similar to land plants
photosynthesis
requires chlorophyll a (polyphyrin ring) xfer electrons
chlorophyll b
pigment found in green algae
