Question

Down syndrome is a common genetic disorder that is caused by having an extra copy of chromosome 21. Which method will show whether or not a baby has down syndrome?

a. Karyotype
b. Family history
c. Genetic survey
d. Punnett square

Answer 1

a. Karyotype

Step-by-step explanation:

Karyotypes describe the chromosome count of an organism, so all the chromosomes would be in front of you, and it'd be easy to tell if there are 2 or 3 chromosome 21.