For each of the following characteristics, indicate whether the trait is common to Phylum Arthropoda or specific to certain classes of arthropods: wings, chewing mouthparts, jointed appendances, number of legs, segmented bodies, exoskeleton.

wings: Insecta class

Chewing mouthparts: some orders in the insects class;

Jointed appendages: common to all athropods

Number of legs: not all the same in some class and even orders

Segmented bodies: common to all

Exoskeleton: common to all

Explanation:

Memeberss in the phylum athropoda all have exoskeleton with itsain component being chitin. They all have segmented bodies; some head, thorax and abdomen like insects, some head, cephalothorax and abdomen like in the crustaceans. All have jointed appendages. Some class possess wings eg insecta and some possess chewing mouthparts egg grasshopers in the class insecta

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.