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

Extra chromosome number 21

Explanation:

Down's syndrome results from the presence of an extra chromosome number 21. This phenomenon where one has three members of a homologous chromosome is called trisomy. Such children are mentally deficient, have a slit eyed appearance and have low chances of surviving because of reduced resistance to infection.

the answer is extra chromosone 21 on edg 2020

Explanation:

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