Question

what is the genotype of a child if the symbol is completely shaded in a pedigree chart? homozygous dominant heterozygous homozygous recessive normal

Explanation:

In a pedigree chart, a completely shaded symbol typically represents an individual with a genetic disorder. If the disorder is recessive, the individual must have two copies of the recessive allele (homozygous recessive) to express the disorder. If it were dominant, only one copy (heterozygous or homozygous dominant) would be needed, but usually, in standard pedigree analysis for recessive disorders (common in many basic genetics problems), shaded = homozygous recessive.

Answer:

Homozygous recessive