Billy has 6 fingers on each hand, a trait called polydactyly, caused by a mutated allele that is dominant. Billy has a brother with 5 fingers on each hand and a brother with 6 fingers on each hand. His mother has 6 fingers on each hand, and his father has 5 fingers on each hand. What is Billy's phenotype

Explanation:

Billy's phenotype is his physical appearance. The phenotype is the physical expression of what the gene is made up of.

Billy is polydactyly i.e he has 6 fingers this is his physical expression also known as phenotype and his genotype will be heterozygous dominant(Tt) for the gene to have express itself in the phenotype of billy. He is heterozygous of the gene because his father is recessive of the gene polydactyly

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.