Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. What would trisomy 21 look like in a karyotype?
missing chromosome 21
extra chromosome 21
missing sex chromosome
extra sex chromosome

Question

Karyotypes can be studied to determine an organism’s chromosomal makeup and to detect genetic defects. Down syndrome is a genetic disorder that is also called trisomy 21. What would trisomy 21 look like in a karyotype?
missing chromosome 21
extra chromosome 21
missing sex chromosome
extra sex chromosome

shadeyghost · Answer

what do you think it is?

anonymous · Answer

So, down syndrome occurs when there is an extra copy of chromosome pair 21, normally it would be just a pair to make 2, but the disorder causes a person to have 3 chromosome 21's. This extra chromosome can actually disrupt the course of normal development for a child causing the characteristics of down syndrome.

anonymous · Answer

I think it is extra chromosome 21

anonymous · Answer

yup