monosomy and trisomy

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darkarcher16
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monosomy and trisomy

Post by darkarcher16 » Tue Nov 21, 2006 3:39 am

canu define monosomy and trisomy and give one example of a condition resulting from monosomy and two examples of a trisomy?

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sachin
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Post by sachin » Tue Nov 21, 2006 3:59 am

Both are examples of ploidy.

Monosomy is prresence/absence of one of the chromosome of a pair.

eg. for sex chromosomes normal condition is XX or XY
some times due to non disjunction the individual become XO.
here O means no chromosome. this is called Turner's syndrome.

Monosomy in autosomes is rare and Lethal.

Trisomy: presence of one extra chromosome with a pair.

for sex chromosomes normal condition is XX or XY
some times due to non disjunction the individual become XXX.
here X extra chromosome is present.

klinfelters syndrome trisomy of sex chromosome XXY.

trisomy in autosomes is in Edward syndrome where trisomy of chromosome number 18 is seen.
downs syndrome trisomy 21.

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