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Cell Division and Chromatid Count

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Cell Division and Chromatid Count

Postby HylaCinerea » Wed Sep 30, 2009 2:09 am

I have a biology assignment due this Friday and just want to make sure I'm doing it right before turning it in. The questions basically ask how many chromatids a diploid cell has during certain parts of mitosis. Could someone tell me if my answers are correct or warn me if they're not? Thanks.

Q: If a cell has a diploid number of 14, how many chromosomes will go to each spindle pole during mitosis?

A: 7

Q: With a diploid number of 10, how many chromatids does a cell have during prophase?

A: I think that a cell just has its usual amount of chromosomes in prophase, so I answered 20 (2 for each chromosome).

Q: How many chromatids are in diploid nuclei of drosophilia (fruit flies) during the telephase of mitosis? How many chromosomes?

A: For this question, I answered "4 and 4." A fruit fly originally has a diploid number of 8. If I'm thinking correctly, the chromosomes are pulled into individual chromatids for distribution during anaphase. When the cell prepares to split in telophase, the chromosomes are just single chromatids.

The picture in my textbook pictures telophase as what appears to be 2 cells joined by a membrane between them. Would they be considered 2 cells at this point, or just 1 since they're still connected?
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Postby JackBean » Thu Oct 01, 2009 1:19 pm

A1: correct fo haploid cell undergoing the mitosis, for diploid cell, it will be 14 ;)
A2: well, depends on type of chromosomes (whether is the centromer in midle or in the end of chromosome)
A3: as above

Cis or trans? That's what matters.
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