The value of E for a system that performs 120 kJ of work on its surroundings and gains 50kJ of heat is ___?

-70

Explanation:

work is being done, so 120 will be negative, heat is being gained, so 50 will be positive.

Delta E = -120 + 50 = -70 kJ

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

the child is heterozygous