By non-concordance, what we mean is that
different individual traits in the human species don’t share the same patterns of variation across geographic space
.. Skin color for example, varies with latitude. … Traits are non-concordant because genes are inherited independently of one another to a large extent.
What are Nonconcordant traits?
A common example of a pair of nonconcordant traits is
skin color and height
. On both an individual and group level, skin color is independent of height (and height is reciprocally independent of skin color). As skin colors become lighter or darker, heights do not change in a predictable, dependent, or concordant way.
What is discordance in genetics?
Discordance: 1. The presence of any given condition such as HIV in only one member of a couple. 2. In genetics,
the presence of a phenotype such as asthma in only one members of a twin pair
.
What does Nonconcordance mean?
Discordant
; inharmonious; disconsonant; not in keeping with; not agreeable with; disagreeing. The patient’s left leg symptoms were nonconcordant with the right leg symptoms. adjective.
What human trait has 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. The frequency of yellow-brown hair among Australian Aborigines illustrates this trend (as shown by the map on the left below).
How is ancestry different from race?
What is the difference between race, ethnicity, and ancestry? Race encompasses inherited, characteristic traits. Ethnicity refers to cultural origin.
Ancestry is simply a line of descent
.
Is genetic drift evolution?
Genetic drift is
a mechanism of evolution
. It refers to random fluctuations in the frequencies of alleles from generation to generation due to chance events. Genetic drift can cause traits to be dominant or disappear from a population. The effects of genetic drift are most pronounced in small populations.
What is a discordance rate?
Discordance rate is
the ratio between total number of discordant subjects to the total number of subjects assessed
. As can be seen in Figure 1, the discordant rate is calculated by adding the off-diagonal counts and dividing by the total number of subjects assessed.
What is a discordance?
1 :
lack of agreement or harmony
: the state or an instance of being discordant. 2 music : dissonance.
What does a high concordance mean?
Concordance, as used in genetics, usually means the presence of the same trait in both members of
a pair
of twins. … Discordant rates that are higher than concordant rates express the influence of the environment on twin traits.
Is arousal mental or physical?
Arousal is the
physiological and psychological state
of being awoken or of sense organs stimulated to a point of perception.
What is unwanted arousal?
Persistent genital arousal disorder (PGAD)
, previously called persistent sexual arousal syndrome, is spontaneous, persistent, unwanted and uncontrollable genital arousal in the absence of sexual stimulation or sexual desire, and is typically not relieved by orgasm.
Is skin color concordant?
One aspect of size is concordant with another aspect of size. But most of human variation is non-concordant. Skin color or eye color or hair color
is not correlated with height or weight
. And they’re definitely not correlated with more complex traits like intelligence or athletic performance.
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. While other organisms might have subspecies that look fairly similar, they are usually pretty genetically distinct from each other.
What factors can result in human variation?
- Environmental Sources. Prenatal environment. Nutrition and Malnutrition. Quality of life and Health care. Pollution and Toxin exposure and other stressors. …
- Genetic Sources. Mutations. Gene mutation. Chromosomal mutation.
Is skin color 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.
