Genetic mutations can have serious effects that are incompatible with life when they are essential for development. Sometimes, the chromosomal mutation is survivable, as in the case of Trisomy 21.
The condition that is caused by these mutations is termed

The correct option is A A chromosomal disorder

The majority of human chromosomal abnormalities occur in the autosomes and some of which are caused by the mutations and results

due to missing, of entire chromosomes, or large segments of them, are duplicated, or otherwise altered. It may cause some serious implication physically but are survivable. For example, Trisomy of the 21 st chromosome causes Down's syndrome (45+XY/45+XX). It is characterized by round face, broad forehead and palmer crease with low intelligence. Thus, the correct answer is option A.