Concerning comb shape in chickens, which of the following is true? multiple choice
the r gene is dominant to the p gene.
the r and p must both be present to produce a walnut comb.
r is recessive to r and produces a rose comb.
p is recessive to p and produces a single comb.

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.

What is the role of pancreatic juice in digestion?