No, the sickle-cell anemia allele won't be eliminated by natural selection.
Sickle-cell anemia trait is controlled by a single gene and the allele (S) for sickle-cell anemia is a harmful autosomal recessive.
It is caused by a mutation in the normal allele (A) for hemoglobin (a protein on red blood cells).
Heterozygotes (AS) with the sickle-cell allele are resistant to malaria, a deadly tropical disease. It is common in many African populations.
In these areas, (S) carriers have been naturally selected, because their red blood cells, containing some abnormal hemoglobin, tend to be in sickle shape when they are infected by the malarial parasite.
Therefore, they are more likely to survive and reproduce. This keeps the S allele in the gene pool.
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Question 2
D) Carbohydrates
Snort it all bro snort it all
Answer:
in the geosphere
Explanation:
The drill will eventually stop within the geosphere.
- The biosphere is the region of the earth populated by living organisms.
- The geosphere is the region of the earth made up of solid rock
- The atmosphere is the gaseous part of the earth.
- The hydrosphere is the liquid part of the earth or where water dominates the earth.
The drill pierces through the geosphere as it initially passes through the hydrosphere. Eventually, the drill stops within the geosphere.
Answer:
External
Explanation:
The Tail is spreading outside of the peacock (Externally)
