If someone's mother was right handed and their father was right handed, could they be left handed? Why or why not? Right-handed is dominant and left-handed is recessive. Use the letter "H". Draw a Punnett Square to support your answer.

Yes

Explanation:

Even though right handed is dominant, each parent carries two genes. It is possible that each parent carries both a dominant and a recessive gene, and with the right combination of chromosomes, those two recessive genes could end up together, making the person left handed.

Punnet square (sorry its kind of hard to imagine, but imagine drawing dris lined between each letter):

    H   h

H  H   H

h  H    h

That bottom right lowercase h is the possible left handed gene.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.