Unlike some physical traits that are simply inherited (qualitative traits) and are controlled by a few genes (for example, coat color and the presence of horns), milk production and body type traits are under the control of many genes (quantitative traits), perhaps a thousand or more.
(some physical traits; are simply inherited; ) (some physical traits; are controlled; by a few genes) (coat color and the presence of horns), milk production and body type traits; are; under the control of many genes)
some physical traits some physical traits coat color and the presence of horns), milk production and body type traits
are simply inherited are controlled are
by a few genes
under the control of many genes