Question

which kind of allele results in the trait indicated by the green color being expressed in the individuals shown here?
x - linked recessive
recessive
dominant
x - linked dominant

Explanation:

To determine the allele type, we analyze the pedigree. In a dominant inheritance pattern, if an allele is dominant, individuals with at least one dominant allele (e.g., WW or Ww) show the trait. Here, the green - colored individuals (showing the trait) have genotypes like WW or Ww, and non - green (white) have ww. If it were recessive, only ww would show the trait, but here W - genotypes show it. X - linked would involve sex chromosomes, but the pedigree doesn't show sex - specific inheritance. So the allele is dominant as it's expressed in heterozygous (Ww) and homozygous dominant (WW) individuals, while recessive (ww) don't show the green trait.

Answer:

dominant (the option labeled "dominant")