Answer: The number of chromosomes in each cell of the dog are inherited from the father = 39 .
Explanation:
Given: Each cell of a dog contains 78 chromosomes.
Exactly 50% of the chromosomes are inherited from the father.
The number of chromosomes in each cell of the dog are inherited from the father = 50% of (chromosomes in each cell)
Hence, The number of chromosomes in each cell of the dog are inherited from the father = 39 .