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meiosis

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meiosis

Postby lohita » Wed Apr 06, 2005 9:25 pm

why does meiosis involve two steps? :?:
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Postby biostudent84 » Wed Apr 06, 2005 11:26 pm

Others can give more detailed information, but the basic answer is:

Crossing over occurs during Meosis I, and halving the number of chromatids* occurs during Meosis II.

Kyle

*Is chromatid the correct term here, or is it supposed to be chromosome? I can never remember the names of the structures during mitosis and meosis.....le sigh
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RE:

Postby envii » Wed Apr 06, 2005 11:30 pm

Meiosis involves two steps because its purpose is to produce eggs and sperm, which have half the amount of chromosomes as do regular cells. In Meiosis, there is no second interphase (when the chromosomes replicate). The chromosomes do not replicate, so that in the second half of meiosis, there are four haploid daughter cells that are produced. The reason for all of this is that when an egg and a sperm come together, they will have the correct number of chromosomes (46).

I hope that makes sense. My head is swimming. :lol:
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Postby lohita » Thu Apr 07, 2005 2:08 am

biostudent84 wrote:Others can give more detailed information, but the basic answer is:

Crossing over occurs during Meosis I, and halving the number of chromatids* occurs during Meosis II.

Kyle

*Is chromatid the correct term here, or is it supposed to be chromosome? I can never remember the names of the structures during mitosis and meosis.....le sigh


i think chromosomes is the correct word to use. :D
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Re: RE:

Postby lohita » Thu Apr 07, 2005 2:12 am

envii wrote:Meiosis involves two steps because its purpose is to produce eggs and sperm, which have half the amount of chromosomes as do regular cells. In Meiosis, there is no second interphase (when the chromosomes replicate). The chromosomes do not replicate, so that in the second half of meiosis, there are four haploid daughter cells that are produced. The reason for all of this is that when an egg and a sperm come together, they will have the correct number of chromosomes (46).

I hope that makes sense. My head is swimming. :lol:


thanks for your answer
i think now i got it :!: :|
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Postby James » Thu Apr 07, 2005 2:13 am

i think chromosomes is the correct word to use.

Yeh, the chromosomes are halved into 2 sister chromatids which migrate to the poles
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