Question

1. which statement about down syndrome, trisomy 21, is true? it is an infectious disease. it is a genetic disorder. it is a communicable disease. it is inherited from a parent.

Explanation:

Down syndrome, or trisomy 21, is caused by an extra copy of chromosome 21. Infectious and communicable diseases are caused by pathogens (like bacteria, viruses) and can spread. Down syndrome is not infectious or communicable. Also, it mainly occurs due to errors in cell division during fetal development (not inherited in the typical Mendelian sense from a parent in most cases). A genetic disorder is a condition caused by an abnormality in an individual's DNA. Since Down syndrome is due to a chromosomal (genetic) abnormality, it is a genetic disorder.

Answer:

It is a genetic disorder.