Why do children look like their parents?

To put it simply, it is both probable and complicated for parents to pass on their genes to their children. There is also the appearance change the day after tomorrow. For example, your father is fat, your mother is thin, and if you give your child crazy food, he naturally looks like your father. If you give your child hunger, you will naturally look more like your mother. Generally speaking, children should be like their parents. As for how similar you are, like your father or your mother, you must miss your father more or be more like your mother. There are only two possibilities!

The following article is for your reference.

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What determines a child's appearance?

Get to know two strange friends, chromosomes and genes. In the same organism, the number and shape of chromosomes are unchanged, so there is a genetic phenomenon that children resemble their parents. Of the 46 chromosomes of the fetus, some are from the father and some are from the mother. In other words, the fetus carries both the genetic information of the father and the genetic information of the mother. These genetic information together control the characteristics of the fetus. Genes are places where genetic information is stored. A gene often carries one or more genetic information of ancestors and determines one or more traits and characteristics of offspring. Therefore, it is it that holds the "power of life and death" of heredity.

Gene is a very tiny substance. Genes are substances many times smaller than chromosomes. It consists of a compound called deoxyribonucleic acid (DNA). They are arranged on chromosomes in a certain order, and chromosomes bring them into human cells. Each chromosome consists of thousands of genes. Genes have stability and variability. Stability means that genes can be self-sufficient, so that future generations can basically maintain the appearance of their ancestors. Variability refers to the fact that genes can mutate under certain factors, thus making various organisms evolve continuously. Genes are arranged in a certain order on chromosomes, which bring genes into human cells. According to research, there can be 10 genes on each chromosome, and the total number of genes they carry is generally considered to be one or two million, and their possible combinations are even more difficult to calculate. This determines that no two people in the world can have exactly the same genetic information, so there are never exactly two people in the whole world. Each gene has a fixed position, which is called "transfer point". It is these genes that determine various genetic traits of people.

As for classification, it can be divided into dominant inheritance and recessive inheritance, autosomal inheritance and sex chromosome inheritance according to characters.

People have many genetic characteristics.

Zeng Weisen, an associate professor in the Department of Cell Biology and Medical Genetics of Southern Medical University, said that human 10 characteristics are directly related to heredity.

Persistent dominant inheritance

1, skin color: the inheritance of skin color has the characteristics of "multiplying first and then averaging". For example, parents with dark skin will never have children with skin; If one side is white and the other side is black, most children will be given a "neutral" skin color that is neither white nor black after being "averaged" in the embryo, but there are also cases that are more biased to one side.

2. Jaw: The shape of the jaw belongs to obvious dominant inheritance. It is a non-negotiable "image" that makes you helpless. Nine times out of ten, his father's son with a pointed chin is also a pointed chin, which is somewhat bizarre.

3, double eyelids: it is also an "absolute" inheritance. Interestingly, most fathers, from three quarters to 100%, leave their double eyelids to their children. Some children are born with single eyelids, so don't worry too much. When he grows up, he will "repair" his double eyelids like his father. According to statistics, only 20% of children have double eyelids, 40% of middle school students and about 50% of college students.

4. Big eyes. Eye shape is hereditary, and big eyes are dominant over small eyes. This is undoubtedly a happy thing for people with small eyes. No matter what it is, as long as the spouse has big eyes, it is easier to have children with big eyes. Long eyelashes are also dominant. The inheritance of eyeball color follows: black is dominant in dark color. In other words, if you envy blue eyes, even if you choose a lover with blue eyes, because you have black eyes, your child will not have blue eyes.

In addition, big earlobe, high nose bridge and long eyelashes are the most characteristic inheritance that can be obtained from parents when the five senses are inherited.

Inheritance of parental dichotomy

Height: Only 30% of the initiative is in your hands, because 35% of the factors that determine height come from father and 35% from mother. If both parents are not tall, then the acquired height factor is only 30%, which also determines that long-term attempts will not have obvious effects.

Obesity: Fat and thin are born. Of course, not every obese child is necessarily obese, but the possibility is much greater than that of ordinary children. If one parent is obese, the probability of child obesity is 32% ~ 33.6%; Both parents are obese, and the obesity rate of children rises to 50%~60%.

Baldness: It has been concluded that baldness is related to genetic inheritance. Male men are the cause of baldness, and the most important thing is genetic constitution. However, the creator seems to favor women. For example, if a father is bald, the probability of passing it on to his son is 50%. Now research shows that if the mother has serious baldness or hair loss in women and men, the son will definitely be bald.

Acne: Some people prefer certain kinds of acne, which will be similar to other family members. If your parents or siblings have severe acne, you are more likely to get acne than others.

Low probability inheritance

Young baldness: It is recessive inheritance, and the probability is low, so parents don't have to worry too much about young baldness, and it will be the same on their children's heads.

Some genes are plastic.

Voice: More than 50% of them are hereditary and can say atavism. Usually boys sound like their father and girls like their mother. However, if the sound quality influenced by parents' physiological anatomical structure is not beautiful, most of it can be changed through acquired pronunciation training. This makes some people with poor voice conditions realize their dream of a sweet voice through scientific and hard practice.

Leg type: the length of the leg will be inherited. If someone wants to increase, they don't have to cut off their feet to increase, but physical exercise can increase.

Others: 20% myopia is hereditary.

Myopia can also be inherited.

High myopia is an autosomal recessive genetic disease, that is, a pair of genes related to myopia are the pathogenic genes of the disease. If only one gene is pathogenic and the other gene is normal, it is not pathogenic, but the carrier of the pathogenic gene. For example, parents are not nearsighted, but they are all high myopia gene carriers, and they do not show myopia. They just pass on the disease-causing genes to their children, so that the children will be nearsighted if they have two myopia genes.

When a man with high myopia is combined with a woman with high myopia (degree or above), the chance of a child getting sick is over 90%. If you add myopia gene carriers, half of the children may be highly myopic, and if you add normal vision or moderate or low myopia, the probability of children's myopia is110. In China, about 1/5 people are carriers of myopia gene.

Congenital inheritance and acquired environment are inseparable.

As parents, everyone wants their next generation to be smart and beautiful. But first of all, we must ensure that there are no congenital genetic diseases, and we must do a good job in every link of marriage, pregnancy and childbirth. The health of babies is closely related to the health of parents.

First of all, we should pay attention to what genetic diseases parents have. Just do a detailed examination before giving birth to a baby. Make sure that there is no disease before you can start the work of "making people". Of course, children born to high IQ couples are not necessarily smart. After all, the characteristics of human body are completely determined by heredity, and most normal and abnormal traits are the result of the interaction between heredity and environment. This requires us to pay attention to internal and external environmental factors, make use of the environment to remedy genetic defects and prevent environmental factors from causing physical and mental defects. Under the premise of no hereditary diseases, pay attention to nutrition and education, even if parents' IQ is not high, they can give birth to children who are smarter, healthier and more intelligent than their parents. (Article source: