What is Clinal variation in anthropology?
What is Clinal variation in anthropology?
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 is Clinal variation in plants?
Clines. A cline is one form of geographic variation in which characteristics of a species change gradually through the species’ geographic range. Many plant and animal species have populations that differ in terms of their morphological, physiological, and biochemical characteristics.
What is the principle of discordance?
The principle of discordance Montagu pointed out that human physical variation was discordant, thus the physical features found in populations were not consistently correlated with each other.
What is Nonconcordant variation?
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 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 distribution of traits?
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. Such patterns can result when selective pressures differ from one region to another and when people mate mostly with their immediate neighbors.
What are examples of clinal distribution?
What are clinal gradients?
The steepness, or gradient, of a cline reflects the extent of the differentiation in the character across a geographic range. For example, a steep cline could indicate large variation in the colour of plumage between adjacent bird populations.
What is concordance and discordance?
A pair of observations is concordant if the subject who is higher on one variable is also higher on the other variable. A pair of observations is discordant if the subject who is higher on one variable is lower on the other variable.
What is the principle of discordance quizlet?
The principle of discordance, as described by the Graves article, states (page 1477) that ‘physical traits which are controlled by different segments of the genome are influenced by selection pressures in different environments.
What are concordant traits?
Concordance, as used in genetics, usually means the presence of the same trait in both members of a pair of twins. However, the strict definition is the probability that a pair of individuals will both have a certain characteristic, given that one of the pair has the characteristic.
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 is an example of clinal distribution?
progressively changing zones of degree difference in frequency of a trait with movement from one region to another. The gradual decrease in frequency of the B blood allele going west in Europe is an example of such a gradation or clinal distribution.
What is 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. The frequency of yellow-brown hair among Australian Aborigines illustrates this trend (as shown by the map on the left below).
Is hair color a clinal distribution?
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 does the word discordant?
Definition of discordant 1a : being at variance : disagreeing discordant opinions. b : quarrelsome a discordant family. 2 music : relating to a discord (see discord entry 1 sense 2) a discordant tone.
How might the skin color of this population negatively impact their health if they moved elsewhere?
How might the skin color of this population have a negative impact on their health if they moved elsewhere? they could suffer negative effects of UV radiation, including sunburn, cell death, increased likelihood of cancer, and the various consequences of folate depletion.
Is an unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers?
An angular unconformity is an unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers. The whole sequence may later be deformed and tilted by further orogenic activity.