Question

the characteristic indicated by the blackened figures is probably... non - dominant. recessive. dominant. sex - linked recessive.

Explanation:

In a pedigree chart, if both parents (blackened, showing the trait) have offspring with and without the trait, a dominant trait is likely. Dominant traits are expressed when at least one dominant allele is present. Here, affected parents (black) have some affected (black) and some unaffected (white) children. For a recessive trait, unaffected parents (homozygous dominant) can't have affected children, but here parents are affected. Sex - linked recessive would show more males affected, but here females are affected too. "Non - dominant" is not a standard genetic term. So the trait is probably dominant.

Answer:

C. dominant.