sarangi2020
Forum Senior
Topics: 14
Posts: 53
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Q: A cell from a buccal smear shows 3 barr bodies. The karyotype is:
1) 46XXXX
2) 47XXXX
3) 48XXXX
4) 49XXXX
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| bluedusk
Forum Elite
Topics: 35
Posts: 217
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hmm. i'm guessing it'd have to be 48xxxx otherwise you'd be aneuploid!
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| Mars-Aris
Forum Elite
Topics: 70
Posts: 257
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i agree 48XXXX
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| polkos
Forum Senior
Topics: 7
Posts: 88
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why can't it be 47xxxx
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| sarangi2020
Forum Senior
Topics: 14
Posts: 53
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yeah..it's 48xxxx
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| Malaysian
Forum Guru
Topics: 28
Posts: 778
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While I understand why everyone chose it to be 48XXX because 46XX is normal genotype and has 1 barrbody.....so 3 barrbodies would mean 48XXXX.However I don't understand why all the other options are incorrect.....as long as you have an extra X chromosome it should form a barrbody.The question saya nothing about incompatible or incompatibility with life.....I personally feel all the answers are valid.
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| drrsm
Forum Newbie
Topics: 1
Posts: 30
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why not 46XXXX???
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| bluedusk
Forum Elite
Topics: 35
Posts: 217
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the way they mean this is, the number is the total number of chromosomes. so if you are 48XXXX, that means you have 44 non-sex chromosomes. normal. but any of the other choices implies more or less than 44 autosomes. not compatible with life.
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| drrsm
Forum Newbie
Topics: 1
Posts: 30
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oh yeah ... thanks!!
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