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How to draw 2n=6

  • 28-11-2015 07:18PM
    #1
    iCrazzy
    Registered Users, Registered Users 2 Posts: 204 ✭✭


    excuse for the question. I know it might look simple but I am getting mixed answers.
    supposing you draw 2n=4 as shown in the attatched pic. thenlogically 2n=6 should be the other pic. but I asked my friend and he said there should be 3 chromosomes. but then there should be 2 chromosomes for 2n=4 aswell so ?
    I looked online some pics showing 6 centromeres like mine while others 3. so how is it.
    please this is driving me nuts


Comments

  • #2
    emersyn
    Registered Users, Registered Users 2 Posts: 430 ✭✭emersyn


    I'm fairly sure 2n=6 means that there's 3 diploid/double-stranded chromosomes present, i.e. there's 3 of the X shapes going down the equator of the nucleus. So I don't think any of those pictures are right - here's what I think they should look like


  • #3
    iCrazzy
    Registered Users, Registered Users 2 Posts: 204 ✭✭iCrazzy


    emersyn wrote: »
    I'm fairly sure 2n=6 means that there's 3 diploid/double-stranded chromosomes present, i.e. there's 3 of the X shapes going down the equator of the nucleus. So I don't think any of those pictures are right - here's what I think they should look like

    thats what I was thinking aswell, but in the bio book they have it the other way ?
    That is why I am confused, which was is right ?


  • #4
    emersyn
    Registered Users, Registered Users 2 Posts: 430 ✭✭emersyn


    So now I'm confused too and I think you were right all along - in my biology book when it explains about diploid cells it says that for example in a cell where 2n = 4, there's 4 chromosomes present - 2 came from the father and 2 came from the mother, so there's two sets. So then a haploid cell that is formed by the 2n=4 cell during meiosis, i.e. the gamete, would be repesented as n = 2. This is because there's 2 chromosomes present: either those of the mother OR those of the father, not both.
    So then during metaphase in mitosis, a cell where 2n = 6 should look like the first photo you attached in your original post because there are 6 chromosomes present: 3 of the father and 3 of the mother.
    Hopefully I have that right now, it looks like I didn't revise that chapter as well as I thought I did :eek:


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