What is an example of Clinal variation?

What is an example of Clinal variation?

One easily visible example of a clinal distribution seen worldwide is the patterning of human variation in skin color. Whether in southern Asia, sub-Saharan Africa, or Australia, dark brown skin is found.

What is Clinal variation?

What are clines? In anthropology we talk about clinal variation. Cline is a term that was devised by the biologist Julian Huxley to represent a geographical gradient in a particular trait across a species.

What causes Clinal variation?

Clines are often cited to be the result of two opposing drivers: selection and gene flow (also known as migration). Selection causes adaptation to the local environment, resulting in different genotypes or phenotypes being favoured in different environments.

What traits have a clinal distribution?

The most easily perceived trait that has a clinal distribution is skin color. Long-term residents of the tropics have a maximum amount of pigmentation in the skin, while long-term residents of arctic locations have the least amount of pigment in the skin.

What is the meaning of clinal?

n. A gradual change in a character or feature across the distributional range of a species or population, usually correlated with an environmental or geographic transition. [From Greek klīnein, to lean; see klei- in Indo-European roots.] clin′al (klī′nəl) adj.

What is a clinal distribution?

Genetically inherited traits often have a clinal distribution. That is to say there is a continuous, progressive gradation moving from one geographic region to another.

What is clinal distribution?

Is hair a clinal distribution?

The covariation of hair form and skin color are an exception to the pattern of clinal discordance. Hair on the head varies, and for a biological reason—spiral and wooly hair insulates the head from ultraviolet radiation.

What does non concordant mean?

nonconcordant (not comparable) Discordant; inharmonious; disconsonant; not in keeping with; not agreeable with; disagreeing. The patient’s left leg symptoms were nonconcordant with the right leg symptoms. (mathematics) not preserving the sign; of opposite sign or zero.

Is Clinicality a word?

The quality of being clinical.

What are clinal distributions and what do they reflect?

Genetically inherited traits often have a clinal distribution. That is to say there is a continuous, progressive gradation moving from one geographic region to another. The frequency of yellow-brown hair among Australian Aborigines illustrates this trend (as shown by the map on the left below).

Is hair type clinal distribution?

What is discordant variation?

BIBLIOGRAPHY. Nonconcordant variation and discordant variation are the phrases that have historically been used to describe the commonly found noncorrelative and nonassociated nature of variation between pairs of genetically controlled traits.

What is the meaning of Clinal?

What is a clout?

1 : a hit especially with the hand. 2 : the power to influence or control situations. clout. verb. clouted; clouting.

What is the difference between concordant and discordant variation?

Discordance, in genetics typically means that a similar trait is not shared between twin members. Studies of twins have shown that genetic traits of monozygotic twins are fully concordant whereas in dizygotic twins, half of genetic traits are concordant, while the other half are discordant.

Which of the following is an example of continuous variation?

An example of continuous variation is human height, which ranges between the shortest person and the tallest person. Any given human will have a height between this range (for example 1.7m, 1.71m, 1.72m, 1.725…), which makes it continuous variation. Characteristics that change gradually overtime show continuous variation.

What is the difference between continuous and discontinuous variation?

Some of the features of the different organisms in a species show continuous variation, and some show discontinuous variation. For any species, a characteristic that changes gradually over a range of values shows continuous variation.

What is the difference between mutation and continuous variation?

Mutation is a change in a gene or chromosome, and can also be inherited. Some of the features of the different organisms in a species show continuous variation, and some show discontinuous variation. For any species, a characteristic that changes gradually over a range of values shows continuous variation. Examples of such characteristics are:

What features of a species show continuous variation?

Some of the features of the different organisms in a species show continuous variation, and some show discontinuous variation. For any species, a characteristic that changes gradually over a range of values shows continuous variation. Examples of such characteristics are: