How powerful genetic inheritance really is: star parents and children who look the same, silly can't tell the difference

It is said that "blood is thicker than water", and blood is really a magical thing. Genetically, daughters will look like dads and sons will look more like moms.

In fact, in real life, it is possible for children to look like anyone. Today we will take stock of the same star families in the entertainment industry.

Look at the strength of genes from the star families in the entertainment industry

When it comes to the strength of genes, the first thing that comes to mind is probably the Tian Liang family. Netizens unanimously believe that Tian Liang's family of four is simply the same face, which is too similar.

Tian Liang and Ye Yiqian look very husband and wife, and the daughter Sen Di's hand and foot are surprisingly similar to her father Tian Liang. Even the son is like he is carved out of a mold with his father.

The strong genes of Wang Baoqiang's family are also worth mentioning, and the three wang Baoqiang sisters and brothers are simply the "copy-paste version" of their mothers.

There are also three generations of Qi Wei's grandchildren, first of all, Qi Wei and her mother are very similar, and Qi Wei's daughter has inherited her mother's good genes.

When these three generations stand together, they always can't help but marvel: "Three generations share a face, and it turns out that genes can be so powerful." ”

Genes are so powerful, so what exactly determines the child's appearance?

In fact, the baby's appearance is difficult to predict before birth, and we can only infer some of the baby's appearance characteristics according to certain scientific principles, such as eyelids and skin color.

Because humans have 23 pairs of chromosomes, 23 of which come from the father's sperm and the other 23 from the mother's egg.

When sperm and eggs are combined, chromosomes from the father and mother are randomly combined, and genes in the same position on each pair of chromosomes control the same trait.

Therefore, from a biological point of view, "whether the baby is more like the father or more like the mother" is not determined by the strength of the gene, but depends on the recessiveness of the gene.

If both alleles on a pair of chromosomes are dominant or one dominant and one recessive, the traits exhibited are both dominant traits, and only when both alleles are recessive do they show recessive traits.

What characteristics of your baby's appearance can be inferred?

1. Whether the baby has single eyelids or double eyelids

In biology, double eyelids are dominant traits.

If the parents are both double eyelids, and it is a combination of AA+AA, AA+Aa genes, then they will only give birth to babies with double eyelids;

If both parents have double eyelids and are a combination of Aa+ Aa genes, then they have a 3/4 chance of giving birth to a double eyelid baby, and 1/4 of them are likely to have a single eyelid baby;

If both parents have single eyelids, which is the combination of aa+aa genes, then they will usually only have children with single eyelids.

If the parents' eyelids are a single pair, if it is a combination of AA+aa genes, they will usually only give birth to children with double eyelids, and if they are a combination of AA+aa genes, the probability of them giving birth to single eyelid babies and double eyelid babies is 1/2 each.

That is to say, if one of the parents is double eyelids, the probability of the child being inherited as a double eyelid is greater than that of a single eyelid.

However, if both parents are single eyelids, the child is generally a single eyelid, and the parents are double eyelids, the child is generally a double eyelid.

2. The color of the baby's eyes

In terms of the color of the iris of the eye, dark color is relatively dominant, and light color is recessive.

According to the principle, if one of the parents has dark eyes, the probability of the child being inherited as dark eyes is greater than that of light eyes.

However, if both parents are light eyes, the child is generally light eyes, if the parents are dark eyes, the child is generally dark eyes.

3. Baby's nose

There is also the baby's nose, high nose bridge and large nose are dominantly inherited, if both husband and wife have a straight nose bridge, or a large nose, then they will be very likely to inherit to the baby.

4. The baby's skin color

Genes determine the synthesis of pigments, which follow the law of "multiplication and re-average". If the parents have darker skin, it is difficult for the babies they give birth to to have white and tender skin;

If one of the spouses is white and the other is black, then the children are likely to have a "neutral" skin color that is neither white nor black.

5. Baby's chin

In particular, the W-shaped chin is commonly known as the "beauty groove", which is a very stubborn gene expression. It is said that this beauty ditch is a genetic trait, and this depression is caused by a genetic defect and is a dominant genetic trait.

If one of the parents carries this defective gene, it will be passed on to the child, and if no one in the parents has a beauty ditch, then the child will not have it.

How should we view the power of this gene?

We should realize that in fact, the role of each pair of genes is very small, and a person's physical characteristics are the result of the joint action of many pairs of genes.

Moreover, although genes are powerful, environmental and nutritional influences early in life can alter gene expression. A good environment can optimize gene expression, and adverse effects can alter gene expression.

Therefore, we should be in awe of this miraculous natural phenomenon, but we do not have to be bound by it.