What causes human variation?

Asked By: SeƱor Karpen | Last Updated: 17th February, 2020
Category: science genetics
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Causes of variation
Causes of differences between individuals include independent assortment, the exchange of genes (crossing over and recombination) during reproduction (through meiosis) and various mutational events. The second main cause of genetic variation is due to the high degree of neutrality of most mutations.

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Similarly, you may ask, what factors can result in human variation?

Many factors can contribute to growth variation across and among populations such as genetic factors, nutrition, environmental conditions, social conditions, and cultural conditions. Genetic Factors: Genotype can have a strong effect on growth as shown in the next two examples.

Additionally, what are some examples of human variation? Here are some examples of inherited variation in humans:

  • eye colour.
  • hair colour.
  • skin colour.
  • lobed or lobeless ears.
  • ability to roll your tongue.

Beside this, what is human variation?

Human variability, or human variation, is the range of possible values for any characteristic, physical or mental, of human beings. Frequently debated areas of variability include cognitive ability, personality, physical appearance (body shape, skin color, etc.) and immunology.

What are the 2 types of variation?

Species Variation Variation in a species is not uncommon, but there are actually two major categories of variation in a species: continuous variation and discontinuous variation. Continuous variation is where the different types of variations are distributed on a continuum.

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Why is human variation important?

It can help scientists understand ancient human population migrations as well as how human groups are biologically related to one another. For medicine, study of human genetic variation may be important because some disease-causing alleles occur more often in people from specific geographic regions.

What is the importance of variation?

Variation is important because it causes evolution and is the basis of heredity. It is advantageous to a population as it enables few individuals to adapt to the environment changes thus, enabling the survival of the population.

How has applied genetics improved human life?

During the past 80 years classical applied genetics has been responsible for: increased yields; overcoming natural breeding barriers; increased genetic diversity for specific uses; expanded geographical limits where crops can be grown; and improved plant quality.

How is genetics important to human?

The importance of human genetic research. 13.11 Human genetic research generates knowledge with the potential to improve individual and community health. Research can also reveal information about an individual's susceptibility to disease and hence about the individual's future health.

What kind of variation is seen in the height of humans?


Human height is an example of continuous variation. It ranges from that of the shortest person in the world to that of the tallest person. Any height is possible between these values. So it is continuous variation.

What causes variation in height?

About 80 per cent of the normal variation in human height is the result of inherited genetic differences between people, with the rest of the height difference being due to environmental influences, such as diet or upbringing.

Does more chromosomes mean more genetic variation?

Polyploidy – having more than two homologous chromosomes allows for even more recombination during meiosis allowing for even more genetic variability in one's offspring.

What is an example of artificial selection?

Dog breeding is another prime example of artificial selection. For example, broccoli, cauliflower, and cabbage were all derived from the wild mustard plant through selective breeding. Artificial selection appeals to humans since it is faster than natural selection and allows humans to mold organisms to their needs.

What are the human cultural variation?

Cultural variation refers to the rich diversity in social practices that different cultures exhibit around the world. Cuisine and art all change from one culture to the next, but so do gender roles, economic systems, and social hierarchy among any number of other humanly organised behaviours.

What do u mean by variation?


Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).

Do all humans have the same genome?

The human genome is mostly the same in all people. But there are variations across the genome. This genetic variation accounts for about 0.001 percent of each person's DNA and contributes to differences in appearance and health. People who are closely related have more similar DNA.

How closely related are humans?

Humans, chimpanzees, gorillas, orangutans and their extinct ancestors form a family of organisms known as the Hominidae. Researchers generally agree that among the living animals in this group, humans are most closely related to chimpanzees, judging from comparisons of anatomy and genetics.

What is variation example?

The individual members of a species also have differences in characteristics. For example, humans have different coloured eyes, and dogs have different length tails. This means that no two members of a species are identical. The differences between the individuals in a species is called variation.

What type of variation is eye Colour?

A specific mutation within the HERC2 gene, a gene that regulates OCA2 expression, is partly responsible for blue eyes. Other genes implicated in eye color variation are SLC24A4 and TYR.

Does anyone have the same DNA?


The Claim: Identical Twins Have Identical DNA. It is a basic tenet of human biology, taught in grade schools everywhere: Identical twins come from the same fertilized egg and, thus, share identical genetic profiles. But according to new research, though identical twins share very similar genes, identical they are not.

Do we all have the same DNA?

It's often said that humans are 99.9% identical. and what makes us unique is a measly 0.1% of our genome. This may seem insignificant. But what these declarations fail to point out is that the human genome is made up of three billion base pairs—which means 0.1% is still equal to three million base pairs.

What is variation and types of variation?

Genetic diversity, differences within a species. variation may be defined as the differences among the individual of the same species. Intra specific variation among the different genera. They have two types somatic variation and germinal variation.