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EEB340H1 Lecture 14: EEB340 Lecture 14.docx

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10 Apr 2012

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Ecology & Evolutionary Biology

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Document Summary

Lecture 14: the evolution of alternation of generations. Degradation of the callose wall now each spore begins to develop and deposit sporopollenin callose wall then degrades and tapetum beings to synthesize and secrete sporopollening, making spore cell walls more complex. End up with mature spores with sporopollening in their walls. Believed that to go from zygotic to sporic meiosis life cycle, there was a delay in meiosis and interrupted by mitotic divisions of zygotic. Egg is retained on the haploid individual feature was co-opted by land plants transfer cell walls are important for short distance transport because the zygote is symplastically isolated. Even adjacent filaments will provide nutrients for the zygote.

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Related Questions

5. Use fern life cycle to answer the following questions.

a) Are the spores produced by the sporophyte formed by meiosis or mitosis?

b) Do the spores belong to the gametophyte or the sporophyte generation?

c) Are the gametes produced by mitosis or meiosis?

d) Is the dominant generation for bryophytes the gametophyte or the sporophyte?

e) Is the dominant generation for ferns the gametophyte or the sporophyte?

f) Can you suggest any ecological role for ferns?

4) Use the fungal life cycle to answer the questions.

a) Define plasmogamy and karyogamy.

b) Name one difference between asexual spores and sexual spores.

c) How did zygomycota (zygote fungi) get its name? What is the name of the structure that makes this group of fungi distinct?

cerisebuffalo309

For General Botany

A. The first haploid cells that are the product of meiosis in organisms with alternation of generations or haplontic life cycles. = ?

B. A life cycle in which the only haploid cells ever produced are the gametes and the diploid zygote undergoes mitosis. = ?

C. A shared derived charatcer that defines a monophyletic group. = ?

D. The Pigment lost from the chloroplast with the origin of the green plants. =?

E. The name for a multi-celled diploid organism in any organism with any type of life cycle. = ?

spores and gametes are ______ and ________
a. muticellular /dipolied b. multicelluar/haploid c. unicellar/dipolid d. unicellar/haploid or e. they can be any of theabove.

which of the following does not have isomorphic alternation ofgeneration?
a. porphra, b ulva, c etocarpus d griffitsia, e cladophora ab noneof the above
ac all the above

a maple tree is a vascular plant, therefore, it is a
a. zygote b gamete, c. spore, d gametophyte ab. it is none of theabove

the sporophyte generation is more dominant in
a. smaller less complex plants b large, more complex plants, c thegametophyte generation is equally dominant in all plants d thegametophte gen. is not dominant in any plants

whis true for a fern leaf and a fern spore? a. both are diploid bboth are haploied, c leaf is haploid, spore is diploid d . leaf isdiploid, spore is haploid