What are the rules for inheritance of children’s IQ?

Genetics is amazing. We should be grateful to our parents for giving us a unique self. Nowadays, eugenics is advocated, and giving birth to a beautiful and smart baby is the wish of every expectant mother. In addition to external factors, genetics plays a large role. For example, half of our height, whether our hair is yellow or black, whether our skin is white, our personality, and the IQ of our children all depend on the parents who gave us life. So, will a child's IQ be inherited more from the father or the mother? Is there any pattern? In fact, this has something to do with the child's gender. Let’s take a look at the specific rules below.

1. Whose genes are more important for intelligence? —Mom

Intelligence is somewhat hereditary, but is also influenced by acquired factors such as environment, nutrition, and education. According to scientists, genetics accounts for about 50%-60% of the influence on intelligence. In terms of genetics, if the mother is smart, the child she gives birth to will mostly be smart. If it is a boy, he will be even smarter. The reason is that the genes related to human intelligence are mainly concentrated on the X chromosome. Women have two X chromosomes and men only have one, so the mother's intelligence plays a more important role in heredity.

To prove this point, let's first review high school biology knowledge: How do boys and girls come about?

Males are XY, with the X (egg) coming from the mother and the Y (sperm) coming from the father.

Girls are XX, X (egg) comes from the mother, and X (sperm) comes from the father.

Therefore, whether the baby is a boy or a girl is the husband’s fault. Don’t blame the mother’s belly for not being able to bear the baby.

Please note that boys are XY, so all of their IQ comes from their mother's genes, and girls are XX, so their IQ is influenced half by their father and half by their mother.

Because a girl's IQ is influenced by both her father and mother, there will be a neutralizing effect, so the distribution of girls' IQ will show a natural distribution (normal distribution), that is, an inverted bell shape, with the most in the middle and less on both sides.

Then, because boys are completely influenced by only one side, the distribution of boys' IQ will tend to be at two extremes. In other words, there are more geniuses among boys, but at the same time, there are also more idiots among boys.

What does this tell us?

1. If you want to judge whether a boy is smart or not, just look at his mother.

2. Then we use probability to calculate:

The probability of having a boy = 1/2; the probability of having a girl = 1/2.

When giving birth to a boy, the mother's influence on the boy's IQ = 1

When a girl is born, the mother's influence on the girl's IQ = 1/2

So, if you:

1. If you are a boy and you think you are stupid, you must marry a smart girl. In this way, your child still has a 75% chance of turning things around, and life is still full of hope.

2. If you are a girl, you will feel stupid because the chance of you overthrowing others is 75%, so try to have a girl.

3. When you see a boy who is very smart, the probability that his father is very smart is 0% (it should be said that even if his father is very smart, it has no influence on him), but the probability that his mother is very smart is 100%.

So, if you are considering marrying a very smart boy, you have to be careful of his mother, because she may be a very calculating mother-in-law.

2. Whose personality is most influenced by his genes? — Dad

Personality is largely inherited from the father. The formation of personality certainly has innate components, but it is mainly influenced by acquired factors. Comparatively speaking, father's influence is greater than mother's. Among them, the role of fatherly love has a greater impact on daughters. A psychologist believes: "Fathers play an important role in the formation of their daughters' self-esteem, sense of identity and gentle personality." Some experts suggest that fathers can teach their daughters many important lessons and experiences in life, making their daughters' personalities more colorful.

Whose genes are more responsible for appearance? ——Analyze specific issues with specific conditions

Skin color: It always follows the natural law of “multiplication and then averaging”, leaving people with no choice. If the parents have darker skin, they will never have children with fair skin; if one parent is fair and the other dark, the children will most likely have a "neutral" skin color, but there are also cases where they are more biased towards one parent.

Eye shape: A child's eye shape and size are inherited from his or her parents. Big eyes are dominant over small eyes. If one of the parents has big eyes, the likelihood of having a child with big eyes is higher.

Double eyelids: Double eyelids are dominant traits. A baby born to a parent with single eyelids and a parent with double eyelids is very likely to have double eyelids. But if both parents have single eyelids, the children will generally also have single eyelids.

Eye color: Dark colors such as black are dominant over light colors. That is to say, if one person has black eyes and the other has blue eyes, their children will not have blue eyes.

Eyelashes: Long eyelashes are also dominant. As long as one of the parents has long eyelashes, the child is very likely to inherit long eyelashes.

Nose: Generally speaking, a large, high nose with wide nostrils is a dominant trait. If one of the parents has a straight nose, there is a high chance that it will be passed on to the child. The genetic genes of the nose will continue into adulthood. A short nose in childhood may become a high nose in adulthood.

Ears: The shape of the ears is hereditary, with large ears being dominant over small ears. If one of the parents has big ears, the child is very likely to have big ears as well.

Jaw: It is a dominant trait that cannot be "negotiated". If either parent has a prominent large chin, their children will often have a similar chin without exception, and the resemblance may be a little uncanny.

Obesity: Children have a 53% chance of becoming obese. If one of the parents is obese, the probability of the child being obese drops to 40%. This shows that about half of whether a child is fat or not can be determined by human factors. Therefore, parents can make themselves fit through a reasonable diet and adequate exercise.

Baldness: The Creator seems to favor women and only allows baldness to be passed on to men. For example, if the father is bald, there is a 50% chance that the trait will be passed on to his son. Even the mother's father will leave a 25% chance of baldness to his grandchildren.

Acne: This facial disease that worries young boys and girls is actually related to genetics. Because if both parents have suffered from acne, their children's incidence rate will be 20 times higher than those with no family history.

Leg shape: Legs that are similar to those of parents with fat accumulation can be shaped into long and strong legs through sufficient exercise. However, if the legs appear too long or too short due to genetics, there is no way to reshape them and you can only leave it to nature.