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Biology help - chromosome

Ordo

Do chromatids twisted together or not - a or b?

Thanks

Reply 1

Sciatic

It should be (a). Why do you think it could be (b)?

Reply 2

katieMCR

Why do chromosomes stick together?
because they're bromosomes

Reply 3

okey

Original post by katieMCR

Why do chromosomes stick together?
because they're bromosomes

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Reply 4

LoyaltyAb0veAll

Original post by katieMCR

Why do chromosomes stick together?
because they're bromosomes

The door please

Reply 5

Ibrahim Rampuri

Original post by Ordo

Do chromatids twisted together or not - a or b?

Thanks

its B

Reply 6

MMMSS

Original post by Sciatic

It should be (a). Why do you think it could be (b)?

It's B- because each chromatid is from each parent- it wouldn't make sense for both the maternal and paternal chromatid to have a mix

Reply 7

Nayzar

B. Theyre just two seperate strands of DNA which are joined together by the thing in the middle (the centromere)

Btw good one @Sciatic

(edited 7 years ago)

Reply 8

Sciatic

Original post by Nayzar

B. Theyre just two seperate strands of DNA which are joined together by the thing in the middle (the centromere)

Btw good one @Sciatic

Nope, I've always visualised them as (a). Perhaps they are the same thing in two different angles; (a) being seen from above and (b) being seen from laterally.

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Reply 9

Ordo

Original post by MMMSS

It's B- because each chromatid is from each parent- it wouldn't make sense for both the maternal and paternal chromatid to have a mix

Original post by Nayzar

B. Theyre just two seperate strands of DNA which are joined together by the thing in the middle (the centromere)

Thanks guys i understand it now :smile:

Reply 10

Nayzar

Original post by Sciatic

Nope, I've always visualised them as (a). Perhaps they are the same thing in two different angles; (a) being seen from above and (b) being seen from laterally.

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Well true fair enough i guess u could be a but B is the general representation bc its more accurate

Reply 11

bioevangelist

Original post by Ordo

Do chromatids twisted together or not - a or b?

Thanks

Since sister chromatids are identical copies of the original 'chromosome' then both a and b are correct, and it doesn't actually matter.

In reality, b is 'more correct' for A-level since the copies are attached by the centromere but remain separate.

However, sister chromatids are not drawn in different colours as they are identical.

Non-sister chromatids on homologous chromosomes are drawn in different colours as they are non-identical due to allelic variation.