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solniwko [45]
3 years ago
15

How does the gasses in earths air differ from place to place

Biology
2 answers:
suter [353]3 years ago
7 0
Gasses on and in the earth differ places to places because- 
1. depends on their weight and mass, looking at how many no. of protons, neutrons and electrons are there. 
ex. oxygen is less in mountainous area because they are heavier than other gases.
2. depends on the what extra things the atom needs to be stable, like 4 more electrons or any more.
3. depends on their radioactivity and electromagnetic waves....
PS: dont write the last one not really sure abt that 
lara [203]3 years ago
5 0
As molten rocks cool gases such as nitrogen water vapor and carbon dioxide are released
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The population in South Africa is more prone to sickle cell anemia (genotype "ss"). People with genotype "ss" survive only up to
lions [1.4K]
The answer is stabilizing selection.

<span>Sickle-cell anemia is a recessive disorder caused by the presence of two recessive alleles "s", so genotype is "ss". This disorder is characterized by sickle hemoglobin. In an area with malaria, heterozygous individuals "Ss" (with one dominant allele and one recessive allele) have an advantage. These individuals will have both normal and sickle hemoglobin. But pathogen that causes malaria affect only normal hemoglobin, so heterozygous individuals will have half of the hemoglobin resistant to the pathogen and those individuals are resistant to malaria.</span>

Stabilizing selection favors heterozygotes Ss,  disruptive selection favors dominant (SS) and recessive (ss) homozygotes, while directional selection favors dominant (SS) or recessive (ss) homozygote. Since in this example, people with genotype Ss (heterozygotes) are in advantage, then this is an example of stabilizing selection.

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