But around me, there are many boys who look like his father and can't tell where they look like his mother. So is there a scientific basis for the sentence "Daughter follows father, son follows mother"?
To know this question, we must first know what determines the child's appearance.
There is no denying that a child's appearance is determined by his parents' genes.
The father's sperm carries the father's 23 chromosomes, and the mother's egg carries the mother's 23 chromosomes. Together, they form 23 pairs of chromosomes of the embryo. In the process of embryo development, which side will inherit more is mainly determined by alleles.
What are alleles? Generally speaking, it refers to a pair of genes that control relative traits at the same position of a pair of homologous chromosomes, one from the father and the other from the mother.
Genes are dominant and recessive. If both alleles on a pair of chromosomes are dominant, or one is dominant and the other is recessive, then the displayed trait is dominant, and only when both alleles are recessive can the recessive trait be displayed. For example, hair color, pupil color, height and thinness, single and double eyelids and bridge of nose are all related to dominant and recessive genes. As to whether to follow father or mother, it is random.
Here are some genetic genes that parents are concerned about. I hope that parents can face up to the genetics after reading it, and don't believe such words as "daughters follow their fathers and sons follow their mothers".
Eyes: Children's eyes are dominant inheritance. If both parents have big eyes and double eyelids, or one of them is, then the possibility of inheritance is very high. Of course, if parents have small eyes, children will basically be small.
Eyelashes: Many parents want their children to have flickering long eyelashes, and even cut them. This is an unwelcome behavior. In fact, long eyelashes are also dominant inheritance. As long as one parent has long eyelashes, the child will inherit long eyelashes. The probability is very high.
Skin color: If the parents' skin is dark, then the children's skin will not be too white; If the parents are white and black, the child's skin is mostly "neutral", but it may also be biased to one side. Although white skin looks good, even if the skin is not white, as long as it is healthy, it will not affect the face value, so there is no need to believe that "one white covers three ugliness."
Height: On the premise of adequate nutrition, there is a 70% chance that a child's height will be inherited from his parents, of which 35% will come from his father and 35% from his mother. Therefore, if the parents are taller, the height of the child will be more secure. However, this is not absolute. There are also some parents who are not too tall, but their children are taller. Now children eat better, and parental rearing is also very helpful for their height development.
Having said that, parents should be able to see that as long as the parents' genes are good, both the child's face value and height are slightly better. Of course, children's development cannot be trapped in genes. Even if parents' genes are not so good, they can be trained into excellent talents through acquired training. Both inside and outside are important.