This pedigree shows all offspring from several litters of one pair of Labrador Retrievers. What is the ratio of black-coated puppies to chocolate-
coated puppies?
A) 2.9 : 1
B) 2.4 : 1
C) 0.4 : 1
D) 3.5 : 1

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.

a symbiotic relationship with the mitochondria