Question

which characteristic can be determined by amniocentesis and karyotyping?
○ blood type
○ cystic fibrosis
○ hair color
○ trisomy 21
○ duchenne muscular dystrophy

Explanation:

Amniocentesis and karyotyping are used to analyze chromosomes. Trisomy 21 (Down syndrome) is a chromosomal disorder (extra copy of chromosome 21). Blood type is determined by blood tests (not chromosomal analysis). Cystic fibrosis and Duchenne muscular dystrophy are single - gene disorders (not detected by karyotyping which looks at chromosomes). Hair color is a polygenic trait (not detected by karyotyping).

Answer:

trisomy 21