Each horizontal row in a pedigree chart represents "a generation" although it should be noted that pedigree charts can vary according to their purpose. 


Option B, a generation

Explanation:

A pedigree is a tree diagram that represents the relationships between different individuals based on certain facts and medical(genetic evolutionary) histories. Basically , the branches of the tree represents the generations which allows the researcher understand how certain genetic characteristics or traits are sent with in a family

Such as transmission of any genetic diseases from one generation to the other.

Hence, option B is correct



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