Advice 1: What are the outward signs in humans is inherited as a dominant

In the mid 19th century Austrian scientist Gregor Mendel discovered the basic laws of genetic inheritance. The scientific discovery was the Foundation for the development of genetics. In 1953 it was deciphered the structure of DNA, which provides the storage and transfer from generation to generation genetic program.
What are the outward signs in humans is inherited as a dominant
Instruction
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Human body cells contain two DNA-code – for maternal and paternal lines. At conception, the genetic information is blended in a unique combination of characteristics. To predict what DNA in humans is very difficult. Attempts are being made to predict scientists-geneticists, but to provide all the options a person can not yet.
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In the formation of genetic characteristics of a person be strong and weak genes. Strong genes – dominant. This means that these genes will suppress the expression of weak genes and to determine the manifestation of external signs.
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Weak genes – recessive, i.e. in the presence of dominant genes, these genes will not determine the external signs. Recessive genes can provide a display of an attribute only in the case that are paired with the same recessive genes.
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Geneticists have identified the dominant external features of a person. If one of the parents has direct eyes, a Mongoloid type eyes, drooping upper eyelid, long eyelashes, dark eyes, full lips, dimples, freckles, a hooked nose, and dark curly hair – it is likely that the child has these symptoms will manifest.
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Also to the dominant characteristics are: the so-called "Hapsburg" lip, short skull, round face, prominent cheekbones, aquiline nose, wide nostrils and large ears. Early male pattern baldness, a tendency to premature graying, excessive hairiness of the body and dark skin is also determined by dominant genes.
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Recessive outward signs may not occur, if one of the parents they are not. If both parents carry the recessive genes, then the child, these signs may be present. To recessive characteristics include: small eyes, Caucasoid eyes, short eyelashes, grey or blue eyes, no freckles, blond or red hair, light skin.
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A person's appearance is the result of the mixing of many genes. If the father dominant gene of dark hair and the woman has recessive gene of blond hair, most likely, the child will have dark hair. The next generation may have blond hair as a child inherits two genes – dominant dark hair gene and a recessive gene of blond hair. If a recessive gene for blond hair will meet with the same recessive gene at conception, then the baby will be born blonde.
Note
Boys often like her mother, so as to inherit her X chromosome. This chromosome contains a large number of genes responsible for appearance – shape eyebrows, oval face, skin color. The Y‑chromosome that the child receives from the father, not rich in genes responsible for facial features. Girls receive from each parent on the X chromosome, so you can be like father and mother.

Advice 2: What are the signs at conception

Quite often women thinking to myself, thinking how come their pregnancy or not. Of course, it can be found through ultrasound, but this opportunity will not appear until 3-4 weeks after conception. And how do you know the answer to such a question in the first days and weeks?
What are the signs at conception

How conception occurs


The female ovaries contain nearly 200 thousand eggs. By the time a woman reaches puberty, fully developed be only 500. Once a month, ovulation occurs, and at this moment there can be conception.

In the fallopian tube the egg meets the sperm, and merge. From that moment of fertilization – and pregnancy begins.

The sex of the baby is determined by sperm, because it can differ from the egg with only one chromosome. If they are different, then it's a boy, identical to girl.

Then the fertilized egg moves down the fallopian tube and a week later, enters the uterus. There she is introduced into the mucosa, which contains nutrients necessary for the embryo to develop successfully.

Early signs of pregnancy


You need to understand that immediately after conception the woman will not feel the change, and, accordingly, no signs of pregnancy will not occur. To trace this will be at least the tenth day after fertilization. About a week before the expected menstrual period in a woman's body begins hormonal changes, which affects the health and appearance.

The first symptom is breast swelling. Of course, it increases when approaching the menstrual period, but manifested differently. With a successful conception Breasts like swells and increases in size, the halos become blurred, and the nipple grows in size.

Another symptom is aching pain in the abdomen. Before menstruation this is also true, but if a pregnancy, this condition occurs as early as 7-9 days. This is due to the contraction of the uterus.

In some cases, sleepiness, malaise, nausea. But this is not always the signals of pregnancy.

If you followed the basal temperature of your body and everything went like clockwork – at the time of ovulation, it rose to 37 degrees, and then gradually fell, then the pregnancy will start a mess. This symptom is considered the most reliable. So you can almost understand exactly conception occurred or not.

If you still have the confidence that you're pregnant, you can confirm or disprove their guesses by checking the level of HCG hormone in the urine to do a pregnancy test. And remember about mother's intuition. It happens that basic feeling tells a woman about the future baby even before the appearance of various signs and symptoms.
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