Question

ndividuals with Down syndrome have an extra chromosome 21. This is an example of which type of chromosome disorder?
A) duplication .
B) nondisjunction .
C) translocation . @flvsguy

Answer 1

I was thinking A .

Answer 2

No its not

Answer 3

Trisomy occurs when the replicated chromosome fail to separate

Answer 4

Duplication - have two types of genes on the same chromosomes
nondisjunction - a non proper way that sisterchromatids or homolog chromosomes are seperated
translocation - happens in turner syndrome, it crosses over nonhomologs chromosomes - BAD because non homologous chromosomes should never cross giving bad genetics to the offspring,

Answer 5

And this condition is called as Non-disjunction !

Answer 6

-.-----

Answer 7

So B !

Answer 8

Yes, because sisterchromatids are separated at odd number with some cells +1 or -1 in chromosomes.