Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syndrome ?

a) id physical characteristics of someone with the disease.

b) id chemical abnormalities in the blood

c) id parents as being carriers before they have children

d) id presence of an extra copy of chromosome 21

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.