Exception to the law of inheritance Mendel

A group of geneticists from Purdue University in Indiana (USA), claims to have found in the plant Arabidopsis the corrected version of a defective gene inherited from their parents. Specifically, the plant was a carrier of two mutant copies of the gene, which allegedly was believed hitherto been impossible to have a normal offspring.

The researchers analyzed the mutated gene known as Hoth or exalted, for which the plant is not defective opened their flowers, and found that it had changed in 10% of the specimens that reproduced. It is as if a roofer.

in its genome, which has not yet been able to decipher, had retrieved the correct sequence in their genes. If confirmed the discovery, would be a rare exception in the laws inherited enunciated by the father of genetics, the Austrian monk Gregor Mendel in the nineteenth century.

The intelligence, innate or acquired?

The intellectual capacity does not depend on a pair of genes, but several. Is it innate or acquired? If we look at the genealogy of some families, could be tempted to believe in the legacy of talent.

Some scientists point out that intelligence is a 80 per cent of heredity and environment of 20 percent. For example, Johann Sebastian Bach belonged to a race in which 57 men, it is assumed that women were not counted, only six had no connection whatsoever with the music.

But the thing is not so clear.
It has shown that the intelligence quotient (IQ) of children adopted by parents with a socially privileged, and with some socio-professional category, is higher than those adopted children in an environment less favored.

It has also been observed that children of parents with higher education have an IQ higher than those whose parents only have studies below. But it is very difficult to know what percentage of hereditary and how much there is for genetic.

Can not establish whether the parents who conducted the studies were conducted because genetically smarter, or just any additional means to carry them out. Nor can we ensure that the IQ of children adopted in a more favored to be higher due to the influence of the environment; inheritance of their biological parents too.

Genetic inheritance - The Secrets of similar

THE GENETIC HERITAGE
When our children reach the world, parents, we strive to find similar ... but sometimes there are surprises: these are the traits of a family that lejanísimo, mysteries of heredity, have come to light.

But not everything is hereditary; also has the prenatal environment, family environment, learning through imitation. What is innate, what is gained? Science tries to decode all these unknowns.

The innermost secrets of the resemblance
When fertilization occurs, the more clever spermatozoon and get better equipped to penetrate the egg, and the two cells fuse, forming a new one: the zygote. It is the beginning of a new life, a chance encounter, but encrypted.

The nuclei of these cells contain chromatin, a substance that takes a position in the form of bundles of fiber, these beams of the chromosomes are Fiber and own property involved in the mechanisms of hereditary transmission. They are made of deoxyribonucleic acid (DNA), which is shaped like a thread of two complementary strands or rope, coiled in a spiral on the other. Each segment of DNA called gene, and the units responsible for the basic mechanisms of heredity and the development of the individual.

The genes are grouped according to the characteristics that transfer, for example, genes from the egg which transmit the color of the eyes are placed paired with those from the sperm that have the same function. When the quality that conveys a particular gene prevails, it is a dominant gene. It will be recessive if your property is hidden, not manifest itself.

There are also cases where the orders received for the same feature are equally strong or weak, and then you can produce all sorts of surprising results. For example, if the father has his nose cut and straight, and mother, long and respingada, it is possible that the child comes out with a short appendix nasal and respingado. If both characters are recessive, it might show another trait of the family genealogy, perhaps the wide and flat nose of some faraway grandmother.