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 is a Clincheck? .


What are examples of clinal distribution?

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 in anthropology?

What are clines? In anthropology we talk about clinal variation. … And about 30 years after Huxley proposed the term clines, anthropologists came to recognize that pretty much all variation in the human species is clinal – that is to say, continuous and gradual across geography, and not discrete, not racial.

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 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. … A common example of a pair of nonconcordant traits is skin color and height.

What is the meaning of Clinal?

(klīn) 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.

Are humans 99% similar?

All human beings are 99.9 percent identical in their genetic makeup. Differences in the remaining 0.1 percent hold important clues about the causes of diseases.

What is a balanced polymorphism?

n. A system of genes in which two alleles are maintained in stable equilibrium because the heterozygote is more fit than either of the homozygotes.

Can phenotypic plasticity evolve?

If the optimal phenotype in a given environment changes with environmental conditions, then the ability of individuals to express different traits should be advantageous and thus selected for. Hence, phenotypic plasticity can evolve if Darwinian fitness is increased by changing phenotype.

What causes stabilizing selection?

Simply stated, there is no common cause of stabilizing selection, besides the fact that the most average individual is selected for. In that way, like all forms of selection, the cause of stabilizing selection is the increased fitness and reproductive success that the median individuals have.

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).

How do you determine your ethnicity?

Ethnicity is a broader term than race. The term is used to categorize groups of people according to their cultural expression and identification. Commonalities such as racial, national, tribal, religious, linguistic, or cultural origin may be used to describe someone’s ethnicity.

Are all humans genetically compatible?

We humans share 99.9% of our DNA with each other! This makes us far too similar to one another to be considered different subspecies. … For example, some chimp subspecies are more genetically diverse than all living Homo sapiens!

What is the difference between race and cline?

is that race is (biology) a population geographically separated from others of its species that develops significantly different characteristics; (an informal term for) a subspecies while cline is (biology) a gradation in a character or phenotype within a species or other group.

Can a population have more than one cline?

A cline refers to a spatial gradient in a specific, singular trait, rather than a collection of traits; a single population can therefore have as many clines as it has traits, at least in principle. …

What does racial variation mean?

“Racial differences” should be defined as clinical, biological, genetic, or epigenetic factors associated with disease risk, outcome, or treatments not caused by social factors that vary in prevalence in population groups. 14–16.

What does clinically well mean?

adverb. In a clinical manner; dispassionately or analytically. exact ( 8 ) The case of a single patient given STI-571 was reported last month in The New England Journal of Medicine; though she was ridden with tumors, all the tumors responded to the drug and the patient was clinically well. 1.

What does clinical work mean?

CLINICAL WORK means any work related to human trials to assess the dosing, safety and efficacy of a Product and to assess a dose and treatment plan employing such Product(s).

What is clinical use?

Clinical Use means any use of a Product as part of the prevention, diagnosis or treatment of any disease or condition in a patient and all government (i.e., FDA or equivalent foreign governmental body) regulated diagnostic uses in which the result is used in treatment of such patient.

Can 2 person have same DNA?

The possibility of having a secret DNA sharing twin is pretty low. Your DNA is arranged into chromosomes, which are grouped into 23 pairs. … Theoretically, same-sex siblings could be created with the same selection of chromosomes, but the odds of this happening would be one in 246 or about 70 trillion.

How much DNA do we share with potatoes?

“Potato has 12 chromosomes, each one about 70 million base pairs long, which makes it about a quarter the size of the human genome.

Do we share DNA with chimpanzees?

Part of Hall of Human Origins. The chimpanzee and bonobo are humans’ closest living relatives. These three species look alike in many ways, both in body and behavior. … Humans and chimps share a surprising 98.8 percent of their DNA.

What is polymorphism in human genetics?

Genetic polymorphism is a difference in DNA sequence among individuals, groups, or populations. Sources include single nucleotide polymorphisms (SNPs), sequence repeats, insertions, deletions, and recombination. … SNPs are the most common type of genetic variations in humans.

What is stable polymorphism?

average PHENOTYPE with reduced variation in the range.

What are examples of balanced polymorphism?

Sickle Cell disease is an autosomal recessive disorder that causes anemia, joint pain, a swollen spleen, and frequent, severe infections. It illustrates balanced polymorphism because carriers are resistant to malaria, an infection by the parasite Plasmodium falciparum that causes cycles of chills and fever.

Why is phenotypic plasticity beneficial?

Many organisms have the ability to express different phenotypes in response to environmental conditions. Such phenotypic plasticity allows individual organisms to develop appropriate morphological, physiological, or behavioral traits that better fit a particular environment that they encounter.

Can phenotypic plasticity be inherited?

Previous studies have shown that phenotypic plasticity is a heritable trait which varies among populations and species (Schlicht- ing, 1986). … Conversely, if plasticity had a low heritability we might expect specialized individuals to evolve.

What does phenotypic plasticity Why does this phenomenon occur?

Phenotypic plasticity is a phenomenon in which a given genotype may develop different states of a character or group of characters in different environments (King et al. … Character variation within an individual species is typically more determined by environmental factors than by genotype differences.

What are examples of stabilizing selection?

Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density.

How do you describe stabilizing selection?

Stabilizing selection (not to be confused with negative or purifying selection) is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. … This means that most common phenotype in the population is selected for and continues to dominate in future generations.

How do stabilizing and disruptive selection differ?

how do stabilizing and disruptive selection differ? Stabilizing selection reduces the amount of variation in a trait. Disruptive selection increases the amount of variation in trait.

What external factors might produce a cline?

What external factors might produce a cline? A cline is a graded change in a character along a geographic axis. Some clines are produced by a gradation in an environmental variable, as illustrated by the impact of temperature on the frequency of a cold-adaptive allele in mummichog fish.

What is an example of a cline?

A cline is the specific set of traits in a population of a given species that have been influenced by the local environment. For example, a population of warm-blooded animals that lived in a cooler climate closer to the North Pole would have larger bodies, allowing them to better conserve heat.

Is gender inherited or environmental?

The different ways men and women behave, passed down from generation to generation, can be inherited from our social environment — not just from genes, according to a new study.

What are the 6 ethnic groups?

The American Melting Pot While many nations in Africa, Asia, and South America can claim literally hundreds of distinct ethnic groups within its borders, the US Census only recognizes six ethnic categories: white, black, Asian, Amerindian/Alaska native, native Hawaiian/Pacific Islander, and mixed ethnicity. That’s it.

What are the 5 races?

OMB requires that race data be collectd for a minimum of five groups: White, Black or African American, American Indian or Alaska Native, Asian, and Native Hawaiian or Other Pacific Islander. OMB permits the Census Bureau to also use a sixth category – Some Other Race. Respondents may report more than one race.

What is my nationality if I'm Mexican?

Hispanic or Latino: A person of Cuban, Mexican, Puerto Rican, South or Central American, or other Spanish culture or origin, regardless of race.

Which race is the most genetically diverse?

New study confirms that Africans are the most genetically diverse people on Earth. And it claims to pinpoint our center of origin. Geneticists have known for some time that Africans are highly genetically diverse.

What percent of DNA do humans share with bananas?

Even bananas surprisingly still share about 60% of the same DNA as humans!

What ethnic group has the most Neanderthal DNA?

East Asians seem to have the most Neanderthal DNA in their genomes, followed by those of European ancestry. Africans, long thought to have no Neanderthal DNA, were recently found to have genes from the hominins comprising around 0.3 percent of their genome.

What are examples of Clinal distribution?

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.