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DIFFERENT BETWEEN SISTER CHROMATIDS AND CHROMOSOMES

Genetics as it applies to evolution, molecular biology, and medical aspects.

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DIFFERENT BETWEEN SISTER CHROMATIDS AND CHROMOSOMES

Postby hipcheercheerios » Sat Dec 16, 2006 4:23 pm

WHAT'ST HE DIFFERENCE BETWEEN SISTER CHROMATIDS AND HOMOLOGOUS CHROMOSOMES??? thanks.
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Postby Oscerot » Sat Dec 16, 2006 5:15 pm

Well, this is going back at least two years for me, so I may be wrong:

Chromotids: a single strand of a chromosome.
Chromosomes: two sister chromatids.

Basically:
Chromatid = 1.
Chromasome = 1+1 = 2.
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Postby sachin » Sat Dec 16, 2006 6:53 pm

_at_:Oscerot, you R partly correct.

Chromosomes are "I" shaped originally, they become "X" shaped at the time of cell division, the other part that is synthesised from original chromosome"I" and called "sister chromatid".

Chromosomes are in pair "II" and the time of cell division they become "XX".

Ok...??
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Postby Poison » Sat Dec 16, 2006 10:42 pm

Oscerot wrote:Chromosomes: two sister chromatids.


Metaphase chromosomes are like that.

sister chromatid= when chromosomes get paired you call one of the pairs (they are exactly the same, copy of each other) sister chromatids.

homolog chromosome: one taken from mother and one from father. carries genes for same threads, centromers are at the same position and looks like each other, but they are not a copy of each other.
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