What Happens to Children From a Marriage Relationship?

Medical Video: Are You Staying in a Dead Marriage For the Kids

Mammals, most other animals, and certain plants, have evolved to avoid inbreeding, in any form. Some others, such as red cherries, even evolve biochemically complex to ensure that their flowers cannot be fertilized by themselves or by other genetically similar individuals.

Most horde animals (such as lions, primates, and dogs) eject young males from their assemblies in order to avoid marriage with their sisters. Even fruit flies have a sensing mechanism to avoid the possibility of inbreeding in their group, so even in a closed population they maintain more genetic diversity than they should with random marriage.

Marriage between siblings and between parents and children is prohibited in every human culture - with a very limited number of exceptions. A glimpse of the idea of having sex with your siblings or siblings, or your own parents or children, is a terrifying shadow - almost never imagined, even - for most people. Reporting from Psychology Today, psychologist Jonathan Haidt found that almost everyone strongly rejects the prospect of sexual relations between siblings, even in imaginary situations there is no possibility of pregnancy.

Why do living things avoid marriage in blood, aka incest? Because in general, blood relations have a very bad impact on the population or offspring of the results of the marriage.

Descendants of inbreeding have a very high chance of being born with serious congenital defects

Inbreeding, aka incest, is a marriage system between two individuals who are closely related genetically or family lines, in which the two individuals involved in this marriage carry alleles from one ancestor.

Incest is considered a humanitarian problem because this practice opens up greater opportunities for the offspring to receive destructive recessive alleles that are expressed phenotypically. Phenotype is a description of your actual physical characteristics, including seemingly trivial characteristics, such as height and eye color, as well as overall body health, disease history, behavior, and your general character and nature.

In short, a bloodline offspring will have very little genetic diversity in its DNA because the derivative DNA from the father and mother is similar. The lack of variation in DNA can have a negative impact on your health, including the chance of getting rare genetic diseases - albinism, cystic fibrosis, hemophilia, and so on.

Other effects of inbreeding include increased infertility (in parents and their offspring), birth defects such as facial, cleft lip asymmetry or adult stunting, heart problems, certain types of cancer, low birth weight, slow growth rate, and neonatal death. One study found that 40 percent of children from a blood relationship between two first-degree individuals (nuclear families) were born with autosomal recessive abnormalities, congenital physical malformations, or severe intellectual deficits.

The offspring of blood marriage will inherit the same disease

Each person has two sets of 23 chromosomes, one set from father and the other inherited from mother (total 46 chromosomes). Each set of chromosomes has the same genetic set - it functions to build you - meaning you have one copy of each gene. The most important point of what makes every human being different and unique is that a copy of the gene from the mother can be very different from the copy you got from your father.

For example, the gene that makes your hair black consists of one black and non-black version (this is a different version called the allele). Gen skin pigment maker (melanin) consists of one normal version and the other is defective. If you only have a damaged pigment-making gene, you will have albinism (a deficiency of skin pigment).

Having two pairs of genes is a brilliant system. Because, if one copy of your gene is damaged (like the example above), you still have a copy of the gene as a backup. Actually, individuals who have only one damaged gene do not automatically have albinism, because the existing copy will produce enough melanin to cover the deficiency.

However, people who have one damaged gene can still inherit the gene to their offspring - called 'carrier', because they carry a single copy but do not have the disease. This is where the problem will begin to arise for the descendants of incest.

If, for example, a woman is the carrier the gene is damaged, so he has 50 percent going home to bring this gene down to his child. Usually, this will not be a problem as long as he is looking for a partner who has two pairs of healthy genes, so their offspring will almost certainly get at least one copy of a healthy gene. But in cases of incest, it is very likely that your partner (who is your brother or sister, for example) carries the same type of broken gene, because it was passed down from your parents. So, if you take an example of albinism, that means you both as parents are the carrier from the gene that makes melanin damaged. You and your partner each have a 50 percent chance of passing a broken gene on your child, so that your offspring will have a 25 percent chance of having albinism - it looks trivial, but this figure is actually very high.

Indeed, not everyone who has albinism (or other rare diseases) is definitely a production of inbreeding. Everyone has five or ten damaged genes hiding in their DNA. In other words, fate also plays a role when you choose a partner, whether they will carry a damaged gene just like you or not.

But for cases of incest, the risk of both of you carrying a damaged gene becomes very high. Every family is likely to have its own disease gene (such as diabetes), and in-blood marriage is an opportunity for two people the carrier from a broken gene to inherit two copies of a damaged gene to their children. In the end, their offspring can have the disease.

Less variation in DNA, the body's system weakens

This increased risk is also influenced by the weakening of the body's immune system experienced by children from parents of blood due to lack of DNA variation.

The immune system depends on important components of DNA called the Major Histocompatibility Complex (MHC). MHC consists of a group of genes that serve as antidotes to disease.

The key to MHC being able to work well against disease is to have as many varieties of allele types as possible. The more diverse your allele, the better the body will fight disease. Diversity is important because each MHC gene functions to fight different diseases. In addition, each allele of MHC can help the body detect various types of foreign material that infiltrate the body.

When you are involved in inbreeding and have offspring from that relationship, your children will have a variety of DNA chains. Which means that children with incestuous relationships have MHC alleles that have little or no diversity. Having a limited MHC allele will make it difficult for the body to detect a variety of foreign materials, so that the individual will fall sick faster because the immune system cannot work optimally to fight various types of diseases. The result is a sick person.

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