You would expect leptin deficient mice to be . A. Have normal appetite and body mass.
B. Obese and overeating.
C. Same as ghrelin-deficient mice.
D. Thin and anorexic.

Option B.

Obese and over eating

Explanation:

A leptin deficient move would be obese and overeating because leptin is an hormone produced by fat cells that decrease appetite and when it is deficient in the body,the body assumes that there is no enough fat in the body and it send signals for intense hunger and overeating or uncontrollable eating of food which result in accumulation of fats, there by resulting in obesity.