What aspect of the chemical reaction is affected by the enzymes?

The minimum energy required to start the reaction is known as activation energy. Enzymes lower the activation energy because they are  biological catalyst.By this ,a reaction rate become fast and reaction happens without delay.When enzymes lower the activation energy then it means that rate of reaction increases.So we can say that enzymes act as booster for the reaction.During reaction enzymes changes the shape.

take a better picture and ill do it

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

the child is heterozygous