Question

which genetic condition results in the trait indicated by the blue color being expressed in the individuals shown here?
homozygous recessive
x - linked dominant
dominant
x - linked recessive

Explanation:

The pedigree shows two parents with genotype Ff (non-blue, so F is dominant over f). Their blue offspring have genotype ff (homozygous recessive), as recessive traits only express when homozygous. X-linked traits would show sex bias, which is absent here. Dominant traits would express in Ff individuals (parents), which they do not.

Answer:

homozygous recessive