She should ask about what she needs to know and then right it down for when she needs it!
Answer:
i will answer this sooon
Explanation: i just need points
The correct answer for the question that is being presented above is this one: "B. extra chromosome 21." 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. Trisomy 21 look like in a karyotype with <span>extra chromosome 21</span>
