An example of a secondary sex characteristic is the increase in hair on some parts of the body. which organ(s) would be responsible for this trait? check all that apply. the thyroid the ovaries the thymus the adrenal gland the testes the pancreas

ovaries and testes

Secondary sexual characteristics are those characteristics which develop during puberty in humans and in maturity in animals. The growth of the terminal hair found on the scalp, armpit, face and pubic area is because of the  influence of the hormones. Androgens in males and estrogens in females are hormones that are responsible for hair growth in puberty these are produced by the organs testes and ovaries respectively.  

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.