Native Americans and Type O Blood
Modern Native Americans have very high frequencies of Type O blood.
In some places in North and South America, the frequency is as high as 100%. Anthropologists believe that early Native Americans arrived in North America by crossing over the Bering Land Bridge around 15,000 years ago, from East Asia.
Modern East Asian populations, with whom modern Native Americans share ancestry, do not have high frequencies of Type O blood. Instead, they have some of the lowest frequencies of Type O blood in the world.
B. Sickle-Cell Anemia
As many as 20-30% of people living in equatorial Africa have at least one allele on Chromosome 11 that codes for sickle-cell anemia (they have an, "S" rather than an, "A" allele). This is odd because usually, 80% of people who have two S alleles die before they can reproduce,
For each of the following cases:
1. What forces of evolution are at work? State all that apply.
Mutation
Natural Selection
Genetic Drift
Gene Flow.
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Covalent bonds is important in four macromolecules such as proteins (polymers of amino
acids), nucleic acids (polymers of nucleotides), carbohydrates (polymers of
sugars) and lipids (with a variety of modular constituents) because they served
as a basic structure of macromolecules.
In addition, the resulting covalent bond is a result
of sharing a pair of electrons, one from each atom or molecular units.
Stem cells. Or more specifically, embryonic stem cells.
The Answer Is ... 1- The cell cycle control system operates independently of the growth factors
