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 Clinal distribution of trait variation?

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 a Cline and why do anthropologists use this approach to the study of human variation?

A cline is a gradation in the frequency of an allele/trait between populations living in different geographic regions. In order to study human traits that are clinally distributed, it is often required to perform genetic testing to uncover the true frequencies of an allele or trait across a certain geographic space.

What is the principle of discordance?

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.

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 the meaning of Clinal?

(kln) 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 klnein, to lean; see klei- in Indo-European roots.] clinal (klnl) adj.

Is hair color a Clinal distribution trait?

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 reasonspiral and wooly hair insulates the head from ultraviolet radiation.

Is gender inherited or environmental?

Rather than the sexes acting differently because of genetic inheritance, the human environment and culture allow for the transfer of some gender-specific behaviour traits from generation to generation.

What does the film mean by non concordance and within group vs between group variation?

Human race is non-concordant–there is no necessary concordance between biological characteristics and culturally defined groups. Within-group vs. between-group variation: genetically speaking, there can be more variation between members of the same group than variation between members of different groups.

Why is skin color a cline?

The transition of pigmentation from the tropics to northern parts of the globe follows an unbroken gradation, making the distribution of skin color a true cline. The substance that accounts for pigment in the skin is called melanin. The more particles of melanin, the darker the skin.

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.

What is another word for discordance?

In this page you can discover 23 synonyms, antonyms, idiomatic expressions, and related words for discordance, like: conflict, dissentience, dissidence, dissonance, faction, friction, inharmony, schism, strife, variance and war.

What does EFW discordance mean?

Twin growth discordance is a term used in obstetric imaging to describe a significant size or weight difference between the two fetuses of a twin pregnancy. To be classified as a growth discordance, some consider that the estimated fetal weight (EFW) of the smaller twin should fall under the 10th centile.

What does discordant mean in medical terms?

Discordant: 1. Showing discordance, lack of agreement. A couple may be discordant for a sexually transmitted infection, with one partner having it and the other not. 2. In transplantation genetics, between different species.

Do twins have the same DNA?

It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. … While the two babies share the same DNA code, there is more to our genetics than just that.

How much DNA do we share with a dog?

Chimpanzees are our closest relative as a species and we share at least 98% of our genome with them. Our feline friends share 90% of homologous genes with us, with dogs it is 82%, 80% with cows, 69% with rats and 67% with mice [1]. Human and chimpanzee DNA is so similar because the two species are so closely related.

How much DNA do we share with potatoes?

What do we already know about the potato genome? Potato has 12 chromosomes, each one about 70 million base pairs long, which makes it about a quarter the size of the human genome.

What is a Clinal pattern?

Clinical Patterns standardized medical procedures or routines for treating specific medical conditions.

What is clinical basis?

: relating to or based on work done with real patients : of or relating to the medical treatment that is given to patients in hospitals, clinics, etc.

What is meant by clinical evidence?

Clinical Evidence is a compendium of summaries of the best available evidence about what works and what doesn’t work in health care. It is designed to be useful in daily practice by answering common and important clinical questions.

Why are humans physically different?

Physical characteristics such as skin and eye colour, hair type and colour and body shape are determined by genetics, but can also be influenced by the environment. Over long periods of time, the environment will act on the genes to develop particular characteristics within a population.

Are all humans genetically compatible?

Based on an examination of our DNA, any two human beings are 99.9 percent identical. The genetic differences between different groups of human beings are similarly minute. Still, we only have to look around to see an astonishing variety of individual differences in sizes, shapes, and facial features.

Why are we not identical to our parents?

Children usually look a little like their father, and a little like their mother, but they will not be identical to either of their parents. This is because they get half of their DNA and inherited features from each parent.

Is eye Colour inherited or environmental?

Eye color is an inherited trait influenced by more than one gene. These genes are sought using associations to small changes in the genes themselves and in neighboring genes. These changes are known as single-nucleotide polymorphisms or SNPs.

Is eye Colour genetic or environmental?

Eye color is determined by variations in a person’s genes. Most of the genes associated with eye color are involved in the production, transport, or storage of a pigment called melanin. Eye color is directly related to the amount and quality of melanin in the front layers of the iris.

What is between group difference?

Between-group differences show how two or more groups are different, whereas within-group differences show differences among subjects who are in the same group. Within-group differences can come to light when looking at a between-group research study.

Why is it impossible to use biological characteristics to sort people into 4 or 5 consistent groups of races?

Why is it impossible to use biological characteristics to sort people into consistent races? Because there is no such thing as a biological characteristic that can separate one race from another.

Is skin color a physical trait?

Skin color is a classic variable trait in humans, and it’s thought to be adaptive, Tishkoff said. Analysis of the genetic basis of variation in skin color sheds light on how adaptive traits evolve, including those that play a role in disease risk.