Identical twins evoke only moderately similar parental treatment in terms of negativity only moderately similar parental treatment in terms of warmth similar maternal treatment in warmth and negativity because of their identical heredity varied maternal treatment because mothers in particular respond to each child's unique genetic makeup

Similar maternal treatment in warmth and negativity because of their identical heredity.

Explanation:

Identical twins (also known as monozygotic twins) occur when an egg is fertilized to form one zygote, but then divides into two separate embryos. Monozygotic twins appear in around 3 in 1000 deliveries worldwide, with all regions in the world having similar rates. However, the exact cause for the why the zygote splits is unknown. When a mother has identical twins, they usually receive similar maternal treatment because of their identical heredity.

your answer is "the 1950's"

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.