Why does a son look like a mother and a daughter look like a dad?
Recently, many people in a red book shared their genetic experience and told everyone in a practical way:
Dad must find a daughter with big eyes, otherwise the daughter born will become like this
(Mom double eyelids, Dad single eyelids, baby swollen eyes)
And so on
(Dad single eyelid, mom double eyelids, sister swollen foam eyes, brother small inner double)
Sons like moms, daughters like dads?
The mystery of genes can be traced
Many people have heard a saying: sons will grow more like mothers, daughters will look more like fathers.
Even many celebrity couples have bluntly said: if you want a daughter and dare not have a child, what if you look like your father?
(Image source: video screenshot)
Professor Yu Dan, deputy director of the Department of Medical Genetics and director of the Pediatric Genetic Disease Diagnosis and Treatment Center of the Second Hospital of West China of Sichuan University, introduced that this statement has a certain truth, but it is not completely correct.
Scientific studies have found that there are more genes on the x chromosome than the y chromosome.
Daughters' X chromosomes come from mother and father, respectively, so they are genetically affected almost the same by their parents.
The son's X chromosome can only come from the mother, so theoretically, the probability of the son being like a mother is greater than the probability of a daughter being like a father.
Isn't the ugly gene more powerful?
Let's take the double eyelid gene as an example
Netizens: Mom big eyes double eyelids, Dad's small eyes swollen eyes, my little eyes; Mom's hairline is low, Dad's hairline is high, my hairline is high; Mom's round face Daddy's square face, my square face... Why is ugly gene always so domineering!!
Hey, beauty and beauty are always similar, but ugliness is a variety of unique ugliness.
Professor Yu Dan introduced: In general, heredity is a sorting combination of science, not that the ugly gene is very powerful, but the traditional sense of the big beauty / beautiful boy, the need for too many "excellent genes" just the right combination.
Beautiful people can't make mistakes in three courts and five eyes, but when the delicate bone phase comes up with a swollen eye, you will feel that the "ugly gene" of this swollen eye is particularly conspicuous.
Take the double eyelid gene and single eyelid gene that the public cares about the most as an example:
In fact, one of the most easily inherited characteristics of a child's face is double eyelids, and the probability of inheriting a single eyelid is much smaller.
Suppose the dominant trait has a double eyelid of A
Suppose that the single eyelid of the recessive trait is a
AA + AA, then the child must be double eyelids.
AA + Aa, even if one parent carries a single eyelid recessive gene, the child must be double eyelids.
Aa + Aa, both parents are double eyelids, but when both have single eyelid recessive genes, the child may appear aa, there is a 25% chance of single eyelids.
When both parents are single and double, two situations occur:
When one parent has pure dominant double eyelids, even if the other parent has a single eyelid, the child must have double eyelids.
Both parents carry the single eyelid recessive gene, and there is still a 50% chance that children will have double eyelids.
But "genetic determinism" is relative. Phenotype = genotype + environmental effects. The environment mentioned here includes the natural environment, various conditions in development, etc., as well as the influence of other genes (genetic background).
So, every single-eyelid baby should not be sad and discouraged, okay?!
Is it useful to see photos of a beautiful baby during pregnancy?
During pregnancy, parents really do everything they can to give birth to a healthy and beautiful baby!
Eat grapes, listen to music, drink bird's nest, set the photos of beautiful babies as wallpapers... Do these methods work?
(Friends set this beautiful baby as a mobile phone wallpaper)
Professor Yu Dan introduced that pregnant women maintain nutritional balance, proper exercise, and look at beautiful babies to keep their mood comfortable ~ These ways can indeed provide a benign environment for the development of babies, and the babies born may be healthier and more beautiful!
And in fact, the appearance of the doll is not completely determined by the innate, and the acquired factor is also very important!!
The shape of your baby's head can be adjusted through the sleeping position
Long-term use of oral breathing in children can cause facial distortion
Long-term sun protection can avoid being tanned
Good standing and sitting postures greatly affect the overall temperament
Do you parents understand ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
"Doctor Popular Science"
Text/Edit | Separation from cartography | Kita Aoi
Producer | Clear Review | Lan Lan
Image source | Make your own, web screenshots, 123rf, etc
This article is the original of "Sichuan Famous Doctor", and unauthorized reproduction in full or part is prohibited.