One parent has big eyes and one has small eyes, who will the child look like? If the mother is white and the father is black, will the child have black or white skin? Every parent who is expecting a new child is curious to know what physical features the child will have that will resemble him or her. In fact, there are some general rules that govern the inheritance of physical features. In addition to heredity, environment and the interaction between environment and heredity can also be influential factors. We are usually concerned about the appearance of features including skin color, height, fat and thin, eyes, nose, chin, ears, etc., according to the size of the genetic predisposition or probability, differentiated into nearly 100% of the “absolute” heredity (including skin color, chin and double eyelids, etc.), the probability of inheritance of more than half of the (including height, fat and thin, etc.) and the acquired plastic (including voice, leg shape, etc.). It always follows the natural law that parents “neutralize” the color, parents with darker skin will never have children with white skin; if one side is white and the other side is black, then after the embryonic stage of “neutralization”, most of them will give their children a “neutral” color that is neither white nor black. “Neutral” skin color, but occasionally there are more favorable to one side of the situation. This is a “non-negotiable” dominant trait. For example, if either parent has a large, prominent chin, the children will often, without exception, have similar chins, which is a bit of an oddity. If the father has double eyelids, most of them will be passed on to their children, and even if some children are born with single eyelids, most of them will grow up to have double eyelids. In addition, large eyes, large earlobes, high nose, and long eyelashes are all traits that can be significantly inherited from parents when it comes to the inheritance of facial features. Height is 70% dependent on heredity and only 30% influenced by acquired factors. If both parents are tall, the chances of the child being tall are 75% and short are 25%; if one parent is taller and one is lower, the child’s height depends on other factors. Since a child’s height is affected by multiple factors interacting with each other, it is recommended that the child should have a reasonable diet during the developmental stage and develop good habits of living and resting, coupled with proper exercise, all of which will help in the development of the child’s height. If one of the parents is obese, the chances of the child gaining weight is 30%; if both parents are obese, the chances of the child gaining weight is 30% to 60%. It is also said that the mother plays a greater role in the child’s body shape. About half of the fat and thin can be determined by human factors, the child can be completely through the acquired reasonable diet, adequate exercise to make the body proportional. It belongs to the congenital inheritance can be molded later. Usually the boy’s voice size, pitch like the father, the girl like the mother. But this kind of influence brought about by the inheritance of parents’ physiological and anatomical structure can be mostly changed through vocal training. This also belongs to the congenital genetics can be molded, put aside the problem of long legs and short legs, can be completely through the later exercise to make the legs become long and healthy.