What causes phenotypic variation in modern humans?

In humans, the main cause is genetic drift. Serial founder effects and past small population size (increasing the likelihood of genetic drift) may have had an important influence in neutral differences between populations.

What is human phenotypic variation?

Phenotypic variation is a combination of one’s genetics and their surrounding environment, with no interaction or mutual influence between the two. This means that a significant portion of human variability can be controlled by human behavior.

Do humans have variations?

In fact, research results consistently demonstrate that about 85 percent of all human genetic variation exists within human populations, whereas about only 15 percent of variation exists between populations (Figure 4). That is, research reveals that Homo sapiens is one continuously variable, interbreeding species.

What are the 3 types of genetic variation?

For a given population, there are three sources of variation: mutation, recombination, and immigration of genes.

How do you find phenotypic variation?

Variance Components of a Quantitative Trait

  1. VP = VG + VE + VGE VP = total phenotypic variation of the segregating population. …
  2. VG = VA + VD + VI and the total phenotypic variance can be rewritten as.
  3. VP = VA + VD + VI + VE + VGE
  4. Copyright © 1997.

What are the two main factors responsible for phenotypic variation?

Two types of factors are recognized as contributing to the phenotypic variation in a population, genetic and environmental.

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What is the difference between phenotypic and genotypic 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).

Who has the most genetic variation?

This is because most variation is within, rather than between, races. On average, any local population contains 85% of all human genetic variation, and any continent contains 94%. This is because humans have always migrated and mixed their genes.

  • Ireland.
  • Greece.
  • South Africa.
  • Samoa.
  • Mexico.

Can two strangers have the same DNA?

Originally Answered: Can two strangers have the same DNA? No, it is impossible for any two humans to have the same DNA sequence. Even identical twins do not have exactly the same DNA sequence!

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