Poll: Which one represents a homologous pair of chromosomes?
Grey (Text) (1)
11.11%
Green (Text) (8)
88.89%
Philip-flop
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Ok so I seem to be having issues revisiting chromosomes. More specifically what a homologous pair of chromosomes is.

Which one from this diagram (Grey or Green text) represents what a homologous pair of chromosomes is?...
Name:  Homologous Pair of Chromosomes.png
Views: 218
Size:  4.0 KB

Someone please clear this up for me
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AlexLyes
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#2
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The green one.
The red cross could be from mum and the blue cross could be from dad. They are in a cross shape because each chromosome has replicated so they can undergo mitosis or meiosis.
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Rachyray
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The grey text represents a homologous pair of chromosomes.
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AlexLyes
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(Original post by AlexLyes)
The green one.
The red cross could be from mum and the blue cross could be from dad. They are in a cross shape because each chromosome has replicated so they can undergo mitosis or meiosis.
Image
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Philip-flop
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I'm getting mixed answers
(Original post by AlexLyes)
The green one.
The red cross could be from mum and the blue cross could be from dad. They are in a cross shape because each chromosome has replicated so they can undergo mitosis or meiosis.
(Original post by Rachyray)
The grey text represents a homologous pair of chromosomes.
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Lxxa14
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Green is a homologous pair. Grey is one chromosome.
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Lxxa14
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(Original post by AlexLyes)
The green one.
The red cross could be from mum and the blue cross could be from dad. They are in a cross shape because each chromosome has replicated so they can undergo mitosis or meiosis.
What they said
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Logic4Life
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(Original post by Philip-flop)
I'm getting mixed answers
It's the green one. The grey one just shows a pair of sister chromatids. In each pair of the homologous chromosomes, one chromosome has been inherited from the mother and the other from the father.
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RevisionGuide
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(Original post by Philip-flop)
Ok so I seem to be having issues revisiting chromosomes. More specifically what a homologous pair of chromosomes is.

Which one from this diagram (Grey or Green text) represents what a homologous pair of chromosomes is?...
Name:  Homologous Pair of Chromosomes.png
Views: 218
Size:  4.0 KB

Someone please clear this up for me
One homologous pair equals two chromosomes (one maternal and one paternal). One homologous pair has 4 chromatids.
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Rachyray
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(Original post by Philip-flop)
I'm getting mixed answers
Oops sorry, looks like I'm confused too😅
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Philip-flop
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So I've created a poll at the top of the thread as I'm still getting different answers. For those of you who have already commented can you please vote as well? Thank you

I seem to be leaning towards green though!
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Dinasaurus
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(Original post by Philip-flop)
Ok I think I'm actually still confused by this.

Humans have...
46 chromosomes (haploid) which make up 23 pairs of chromosomes (diploid), right?

So that's...
X X X X X
X X X X X
X X X X X
X X X X X
X X X

This means that...
A singular chromosome is in the form (/)
A double-armed chromosome - which has two sister chromatids are in the form (X)
A homologous pair of chromosomes is in the form (XX).

Can someone tell whether I'm right?
Yeah 46 individual chromosomes/23 pairs.
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Philip-flop
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(Original post by Dinasaurus)
Yeah 46 individual chromosomes/23 pairs.
Image
Thank you!

I think I'm slowly getting there, so basically...
A singular chromosome is in the form (/)
A double armed chromosome, which has two sister chromatids - is in the form (X).
And homologous pair of chromosomes is in the form (XX) where one (X) is maternal and the other (X) is paternal.

Also we only get double-armed chromosomes (X) after interphase.

So, humans have 46 singular chromosomes (/), this means when a cell replicates it's DNA during interphase (of Mitosis) we end up with 46 double-armed chromosomes (X) (which can be seen as there being 92 chromatids/singular chromosomes (/)). Then after the cell divides into two, the daughter cells contain 46 singular chromosomes(/). Is this right?

And how about with Meiosis? Do we start with 46 singular chromosomes (/), replicate to end up with 46 double-armed chromosomes (X) (which can be seen as there being 92 chromatids/singular chromosomes (/)). Then the 46 double-armed chromosomes line up in two's in their homologous pairs (XX) and undergo the 1st division process leaving 23 double-armed chromosomes (X) (which can be seen as there being 46 chromatids/singular chromosomes(/)), then a 2nd division follows leaving 23 singular chromosomes which are now the gametes since we have reached the haploid number (n).

Can someone clear this up?
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Dinasaurus
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(Original post by Philip-flop)
Thank you!

I think I'm slowly getting there, so basically...
A singular chromosome is in the form (/)
A double armed chromosome, which has two sister chromatids - is in the form (X).
And homologous pair of chromosomes is in the form (XX) where one (X) is maternal and the other (X) is paternal.

Also we only get double-armed chromosomes (X) after interphase.

So, humans have 46 singular chromosomes (/), this means when a cell replicates it's DNA during interphase (of Mitosis) we end up with 46 double-armed chromosomes (X) (which can be seen as there being 92 chromatids/singular chromosomes (/)). Then after the cell divides into two, the daughter cells contain 46 singular chromosomes(/). Is this right?

And how about with Meiosis? Do we start with 46 singular chromosomes (/), replicate to end up with 46 double-armed chromosomes (X) (which can be seen as there being 92 chromatids/singular chromosomes (/)). Then the 46 double-armed chromosomes line up in two's in their homologous pairs (XX) and undergo the 1st division process leaving 23 double-armed chromosomes (X) (which can be seen as there being 46 chromatids/singular chromosomes(/)), then a 2nd division follows leaving 23 singular chromosomes which are now the gametes since we have reached the haploid number (n).

Can someone clear this up?
Think of mitosis like multiplying but meiosis is dividing, mitosis diploid -> diploid. Meiosis diploid -> haploid.
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Philip-flop
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(Original post by Dinasaurus)
Think of mitosis like multiplying but meiosis is dividing, mitosis diploid -> diploid. Meiosis diploid -> haploid.
Thank you so much

I seriously appreciate your help
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