Genetics is the study of genes and tries to explain what they are and how they work. Genes are how living organisms inherit features or traits from their ancestors; for example, children usually look like their parents because they have inherited their parents' genes.
There are three types of genetic disorders:
Genetics research studies how individual genes or groups of genes are involved in health and disease. Understanding genetic factors and genetic disorders is important in learning more about promoting health and preventing disease.
Genetics includes the study of how human characteristics are inherited from one's parents. It explains how traits as simple as eye color or as complex as susceptibility to diseases run in families.
Scientific research has today advanced further and identified genes coding for the way muscles in our body respond to diet and training, skin types and their response to nutrition, the control of hair fall, risk of diabetic complications, obesity, addictions and a lot more. “This actually came to us from the public.
Genes may predispose certain adults toward violence and aggression, even toward their own children. Such behaviors can in turn have a real environmental impact on the child's mental health and on behavioral outcomes.
Modern genetics focuses on the chemical substance that genes are made of, called deoxyribonucleic acid, or DNA, and the ways in which it affects the chemical reactions that constitute the living processes within the cell. Gene action depends on interaction with the environment.
Genetic factors can contribute to the degree of longevity in at least two important ways: An individual may inherit certain genetic variations that predispose him or her to disease that decreases longevity; other gene variants may confer disease resistance, thereby increasing it.
Genetically, you actually carry more of your mother's genes than your father's. That's because of little organelles that live within your cells, the mitochondria, which you only receive from your mother.
Most of us can expect to live to around 80, some people defy expectations and live to be over 100. The oldest person in history, a French woman named Jeanne Calment lived to 122, but when she was born the average life expectancy was roughly 43. A recent study proposes that the limit to human lifespan is closer to 150.
A gene called GATA6 (GATA binding protein 6) regulates aging of human mesenchymal stem/stromal cells (MSCs), according to new research from the University of Wisconsin-Madison.
Acquired mutations are not passed down if they occur in the somatic cells, meaning body cells other than sperm cells and egg cells. Some acquired mutations occur spontaneously and randomly in genes. Other mutations are caused by environmental factors, such as exposure to certain chemicals or radiation.
Healthy aging and longevity in humans are modulated by a lucky combination of genetic and non-genetic factors. Family studies demonstrated that about 25 % of the variation in human longevity is due to genetic factors.
Longer life spans tend to run in families, which suggests that shared genetics, lifestyle, or both play an important role in determining longevity. The study of longevity genes is a developing science.
Shorter people also appear to have longer average lifespans. The authors suggest that the differences in longevity between the sexes is due to their height differences because men average about 8.0% taller than women and have a 7.9% lower life expectancy at birth.
Aging is likely caused by a combination of reasons. Some theories suggest cells have a predetermined lifespan, while others claim it's caused by error and damage. Other theories say that aging is due to genetic, evolution, or biochemical reactions.
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Biological differences also help to explain women's higher longevity. Scientists believe that estrogen in women combats conditions such as heart disease by helping reduce circulatory levels of harmful cholesterol. Women are also thought to have stronger immune systems than men.
Countries ranked by life expectancy
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Due to the low prevalence of obesity in Japan, the low mortality rates from ischemic heart disease and cancer are thought to be the reasons behind the longevity of Japanese people. Japanese have a low intake of red meat, specifically saturated fatty acids.