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Postby undisclothesed » Tue Apr 18, 2006 5:37 pm

I have a few questions i can't find answers to, can you guys help me out? :?:

1. What similarities do gymnosperms and anthophytes have in their mechanisms of gamete formation, fertilization, and dispersal? What Differences?

2. How does a seed differ from a spore?

3. If a species of pine has a diploid number of chromosomes equal to 40, how many chromosomes will be found in an embryo in the seed? In a pollen nucleus? In a megasporocyte? In a nucellus tissue?
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Postby Linn » Wed Apr 19, 2006 3:08 am

those are really not in your book?

the seed one is easy.
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Postby undisclothesed » Mon Apr 24, 2006 4:01 pm

i'm having trouble with the first two.

can someone correct me if i'm wrong for my 3rd question:

embryo- 40 chromosomes
pollen nucleus- 20 chromosomes
megasporocyte- 40 chromosomes
nucellus tissue- 40 chromosomes
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Postby Linn » Tue Apr 25, 2006 1:39 am

anthophytes
I am confused about this word. :? Is there an other name for it?
Do you mean bryophyte or antheridia? or anthocyanis?
and I think this topic should be in the genetics section, too difficult for me to answer.

just remember that the gametes of any organism are haploid (n), so you need times whatever number by 2???
so 2n = diploid

PS: any cell having one set of chromosomes is haploid
so to each example you gave you found out what each has?
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Postby undisclothesed » Tue Apr 25, 2006 2:45 am

anthophytes are flowering plants.

# of Chromosomes:
*embryos are diploid (2n) so the # of chromosomes would be 40
*pollen is haploid so the# of chromosome would be 20
*i believe the megasporocyte is diploid, but i am not sure..
*nucellus is diploid tissue so the # of chromosomes would be 40

I'm still lost on the first question, can anyone help me out.
1. What similarities do gymnosperms and anthophytes have in their
mechanisms of gamete formation, fertilization, and dispersal? What Differences?
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Postby Linn » Tue Apr 25, 2006 12:53 pm

yes, you are correct: megasporocyte is diploid.


anthophytes are flowering plants.


[size=18]LOL a few years ago they were called angiosperms :!: [/size]so now I can help you out with that first question, but I wonder why you cant find this in your book? or do you try to look in google?:

1. What similarities do gymnosperms and anthophytes have in their
mechanisms of gamete formation, fertilization, and dispersal? What Differences?


similarities:both gymnosperms and "anthophytes" AKA angiosperms,
are both heterosporus.

Differences: in gymnosperms seed is on the surface of the sporophyll
in angiosperms seed is enclosed in sporophylls because it will form one or more carpels of the ovary (to become flowers)

I think you should google it :)
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Postby Jdse94 » Thu May 04, 2006 12:06 am

Any one here know the life span of angiosperms. You guys seem to know a lot about them!
Thanks
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Postby Linn » Thu May 04, 2006 2:30 am

well there is quite a large range there :wink:
If you google about them you will find out about them, from trees to >flowers.
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Postby AstusAleator » Thu May 04, 2006 7:10 am

Angiosperms are annual, biennial, or perennial.
Annual should be obvious: they go from seed to death in the course of a year.
Biennial angiosperms will grow for a year or so and then flower and die in the second year.
Perrenials persist for many years. There are some living perennials that are centuries old.
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Postby Jdse94 » Thu May 04, 2006 11:01 am

Thanks A Lot!
Really helped me out :lol: :P 8)
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