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B. negative charge only

Explanation:

The saying "opposites attract" is true in the case. Since the rod is positively charged, the sphere must have a negative charge to be attracted to it.

A sphere that is positively charged would be repelled from the rod, and a neutral sphere would not be attracted or repelled.

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous

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