How often we hear from prospective parents-phrase the question, "I wonder who would be like our baby?Maybe he will have eyes like my dad, and sponges as a mother? ".Usually the parents do not rely on the basics of genetics, when asked such questions, even though they affect the similarity of a child with someone from adults.It is due to heredity, kids are like the parents, but never look as full copies.To this effect the multiplicity and diversity of genes.
Once the baby is born, parents immediately trying to determine what he looks like, but do it is still very early.Yes, he could already occur some dominant trait inherited from one or both parents, but at this age kids are very fast change and acquire the features of one or the other parent, they appear gradually recessive and dominant traits inherent in each.What is the dominant features of the person?
Each person there 46 chromosomes, which occur with the full merger of germ cells.These chromosomes contain genetic information from each parent, and it becomes the basis for the future of the body.The process of formation of the genetic basis is very complicated, while it in simple terms, all parent features are not only summed up, but then also equally divided.So what will you have your little eyes, like mom or dad, it depends largely on chance.Here it is worth remembering and about the concept of a dominant trait.From school biology course we all know that genes are divided into the strengths and weaknesses.During their confrontation, and receive a certain combination of features.
to the dominant features of human concern: dark eyes and hair, a large nose, full lips.Simply put - all dark and a great will to prevail over light and small.That is, if my dad's eyes are brown, and my mother blue, then most likely, the child will inherit the color of the eyes of his father.But do not forget that the recessive and dominant traits are not the absolute measure of future appearance.For example, if both parents have brown eyes, the child's eyes may be blue.Moreover, according to the laws of genetics, the manifestation of recessive traits observed in 25% of cases.Besides the fact that there is a dominant trait, there are heredity, which also affects the formation of the exterior of the child.Then, in adulthood, the appearance will be determined not only have a genetic predisposition, but human and external factors: diet, lifestyle.
If you try to trace how the dominant trait is inherited in several generations, we can see that there is some regularity in its manifestations - in every generation, this feature will be seen and be sure to attend one of the parents.Subsequently, he will appear at half-born babies.And if we talk about the recessive trait - it will appear in one generation, in the analysis of a number, and the number of children who have it will be observed, will be only a quarter.
Unfortunately, there are pathological hereditary characteristics, which manifest themselves as a disease and can also be transmitted from parents to children as dominant.But as a result of mutations of these pathological symptoms can be completely excluded from the chain of genes that lead to the disappearance of the "patients" genetic traits, and the child did not detect the disease, which has been for many generations pursued all the relatives.The average frequency of hereditary ailments is still ongoing.This is due to the fact that due to the mixing of populations related to the migration of the population, each person's set of genes is constantly updated.Along with the update, and the mutation occurs.
