Search results
Results From The WOW.Com Content Network
This list concerns blood type distribution between countries and regions. Blood type (also called a blood group ) is a classification of blood , based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs).
The genetic divergence of R1a (M420) is estimated to have occurred 25,000 [2] years ago, which is the time of the last glacial maximum.A 2014 study by Peter A. Underhill et al., using 16,244 individuals from over 126 populations from across Eurasia, concluded that there was "a compelling case for the Middle East, possibly near present-day Iran, as the geographic origin of hg R1a". [2]
Parkinson's disease (PD), or simply Parkinson's, is a neurodegenerative disease of mainly the central nervous system that affects both the motor and non-motor systems of the body. The symptoms usually emerge slowly, and, as the disease progresses, non-motor symptoms become more common. Usual symptoms include tremors, slowness of movement ...
Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...
Population genomic research has studied the origin and formation of modern East Asians. The ancestors of East Asians (Ancient East Eurasians) split from other human populations possibly as early as 70,000 to 50,000 years ago. Possible routes into East Asia include a northern route model from Central Asia, beginning north of the Himalayas, and a ...
Notch-mediated juxtacrine signal between adjacent cells. Notch signaling steps. The Notch signaling pathway is a highly conserved cell signaling system present in most animals. [1] Mammals possess four different notch receptors, referred to as NOTCH1, NOTCH2, NOTCH3, and NOTCH4. [2] The notch receptor is a single-pass transmembrane receptor ...
Canada, a country with a comparatively low suicide rate overall at 10.3 incidents per 100,000 people in 2016, exhibits one such discrepancy. When comparing the suicide rate of Indigenous peoples in Canada, the rate of suicide increases to 24.3 incidents per 100,000 people in 2016, [18] a rate among the ten highest in the world.
By way of analogy, the allele (a particular version of a gene) which causes sickle cell disease when two copies are present, also confers an adaptive advantage when one copy is present by providing resistance to malaria with non-symptomatic sickle cell trait—which is known as "heterozygote advantage". [96]