السؤال 115

On a pedigree diagram that follows one characteristic, what does a shaded symbol mean?

That individual carries one allele for the characteristic without showing it
That individual has been tested to find its alleles
That individual shows the characteristic being followedالإجابة الصحيحة
That individual has died

الشرح

Shading records what can be seen in the individual, so a shaded symbol marks somebody in whom the characteristic being followed actually appears, and an unshaded symbol marks somebody in whom it does not. Reading shading as a hidden allele confuses what a diagram of appearances can record with what only a genetic test could establish.

الشرح

تابع هذا الاختبار