IQ follows mom, personality follows dad? Who does the child's genes come from?
"Fortunately, my child inherited my big eyes and high nose, just like his father. I don't know how ugly it is! "
"My child's academic performance is so poor, it must be inherited from his mother. If it is genetic, my IQ can be admitted to 985,211."
"Our two families are quite tall, and our two children are also inherited, which is quite conspicuous in the crowd."
We can hear the above conversation from time to time in our lives.
Every father and mother hope that their children can inherit their own advantages.
What is the relationship between children's characteristics, appearance, personality, IQ and heredity?
Which ones are father's? Which ones come from the mother?
Let's look at genetics!
(1) personality
Personality belongs to polygenic inheritance, which is determined by genes and environment. A child's personality does not simply come from one parent, but depends on the sum of the genes of both parents.
You can understand it this way: for example, if the father is introverted and the mother is extroverted, then the personality gene passed on to the child depends on which gene prevails. If the father's personality gene is strong, then the child's personality is generally introverted.
It should not be ignored that at present, scientific research has found that the genes of violence and anger in parents' personality will be passed on to their children. Of course, this does not rule out acquired factors. However, we still have to restrain and change our bad temper so as not to pass it on from generation to generation!
(2) IQ
The genetic influence on IQ accounts for 50%~60%. If both parents are high IQ people, then there is a high probability that the child is high IQ. It is widely rumored on the Internet that whether a child is smart or not depends on the mother. This pot really doesn't carry.
When it comes to IQ inheritance, we should start with the X chromosome, mainly because many IQ-related genes are on the X chromosome. Although women have two X chromosomes, more than men 1, there is no scientific proof that mothers can determine their children's IQ.
Some researchers have counted the IQ data of parents and children of more than 2,000 families in the United States. The results show that the IQ between mothers and children is slightly stronger than that between fathers and children, which are 0.443 and 0.4 1 1 respectively, which only shows that mothers have a slightly greater influence on children's IQ than fathers.
The inheritance of IQ is also influenced by acquired factors such as environment, nutrition and education. It is more practical to cultivate children's learning ability from an early age!
(3) Appearance
Whose inheritance is appearance? Dominant genes are dominant relative to recessive genes! Of course, these genetic laws are not absolute because of gene mutation or acquired growth and development.
As for the question of being like father or mother, the genes that determine facial features are mostly located on the autosome of human cells, not on the sex chromosome. So, there is no saying that you will look like your father or your mother.
height
Children's height genetic factors, parents each account for half, parents are not high, it is difficult for children to think high. Parents' heredity is the main factor that determines a child's height, which determines about 70% of the child's height, 35% comes from the father and 35% comes from the mother.
The remaining 30% is mainly affected by acquired living habits, eating conditions and other factors. For example, children born after 2 1 century, because of the improvement of living conditions, the average height is slowly increasing.
fat
Body shape also belongs to polygenic inheritance, parents are fat, and children are more likely to be fat. According to statistics, parents are thin, and babies are mostly thin, and only 7% will be fat; One parent is obese, and the baby is 40% obese; Both parents are obese, and the baby is 80% obese. Obese people often have a family history.
But environmental factors also have a great influence on body shape, such as living conditions after birth, nutrition, exercise, work nature and so on. You can also make your posture symmetrical through reasonable diet and adequate exercise.
situation
The whole follows the natural law of "average after multiplication", leaving people no choice. If parents have dark skin, there will be no children with white skin; If one person is white and the other is black, most of them will give their children a "neutral" skin color, and some will be more inclined to one side.
Eye shape
The shape and size of children's eyes are inherited from their parents, and big eyes are dominant over small eyes. If one of the parents has big eyes, the child is more likely to have big eyes.
eyelid
Double eyelids are dominant inheritance, and parents with single eyelids and double eyelids can also have children with double eyelids. But both parents have single eyelids, and the average child also has single eyelids.
eyeball
Compared with light color, dark color such as black is dominant inheritance. Parents have black eyes and blue eyes, and the children born are basically black eyes. Unless one parent with black eyes also has the gene of blue eyes, this probability is very small.
eyelash
Long eyelashes are also dominant. As long as one parent has long eyelashes, children are likely to inherit long eyelashes.
nose
The nose is big and high, but the nostril width is dominant. If one of the parents has a straight nose, it is likely to be passed on to the child. The inheritance of the nose will continue into adulthood. When I was a child, my nose was short, but when I grow up, it may become a high nose bridge.
ear
The shape of the ear is inherited, and the big ear is dominant over the small ear. As long as one parent has big ears, then the child is likely to have a pair of big ears.
upper jaw bone
It is dominant inheritance and cannot be "discussed". Either parent has a prominent chin, and children usually have the same chin without exception, which is somewhat bizarre.
baldhead
Baldness genes are generally inherited by autosomal dominant genes. Men are bald due to the influence of androgen, while women generally have sparse hair and are not easy to be noticed.
Relevant suggestions. ※。
Genes that keep people awake.
Sometimes parents can't do it and children can, even identical twins can't do exactly the same thing. In other words, even "heredity" cannot determine 100%.
Human evolution is too interesting to sleep.
The evolutionary history of mankind is very interesting. Where on earth did we come from? Today, our bodies are not only marked by the evolution of primates such as apes, but also by the paleontological history that lasted from 4 billion years ago to the present.
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