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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There are manny kinds of producers but which one ate u talking about ...... here are some ⭐️ Either employed by a production company or working independently, producers plan and coordinate various aspects of film production, such as selecting the script; coordinating writing, directing, and editing; and arranging financing. ... Finally, the producer will oversee the marketing and distribution.
A continuing-care retirement community
A continuing
care retirement community is a community that provides multiple care levels all
on one campus. These multiple care levels which could include independent
living, assisted living, memory care or skilled nursing and rehabilitation are set
up to provide all of the care that one will need throughout his lifetime. For the question given above, a
continuing-care retirement community might be best alternative for this couple because
it has the resources and staff available to meet their needs and they can rest
easy if their health changes in the future.
Answer:
(4) tissues
Explanation:
There are three circles the innermost circle indicated the cells middle circle is the tissues and the outermost circle indicated the organs. Multicellular organisms are made up of thousands of different types of cells .Different cells constitute together forma a tissues and different tissues form a organ and different organs together form an organ system. Hence the X labeled circle denotes the tissues.
Answer:
A. the energy required to maintain vital body functions.
