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soldi70 [24.7K]
3 years ago
8

In three to five sentences, explain why sickle cell disease became so prevalent in certain East African populations.

Biology
1 answer:
Vladimir [108]3 years ago
4 0

Answer:

A research study by Dr. Tony Allison proved that there was a connection between infectious parasitic disease, malaria and genetic disease, sickle cell anemia. As the malarial parasite was more common in East Africa, hence sickle cell became more prevalent in Est Africa.  After collecting  samples, Dr. Tony Allison found that children carrying the sickle  cell allele had a lower parasite count, as if they were  partially protected against malaria.

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In your own words, explain why an earthworm cannot survive if it were cut in half. PLEASE HURRY​
Masja [62]
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If you extract the DNA of the coliphage φ X174, you willfind that its composition is 25 percent A, 33 percent T,24 percent G, an
kifflom [539]

Answer:

This composition of nucleotide given in the question do not obey the chargaff"s rule.

Explanation:

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3 years ago
Which describes a promoter
Shalnov [3]
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3 years ago
Read 2 more answers
En los seres vivos acuaticos el oxigeno es tomado del __________ y penetra a la celula por el fenomeno de ___________
andrezito [222]

Answer:

En los seres vivos acuáticos el oxigeno es tomado del <u><em>agua</em></u> y penetra a la célula por el fenómeno de <em><u>respiración branquial.</u></em>

Explanation:

La respiración es el proceso mediante el cual los seres vivos obtienen oxígeno.  Es decir, la respiración implica el reemplazo del dióxido de carbono en los pulmones por oxígeno del aire, y puede ser pulmonar, branquial, traqueal o cutánea.

La respiración branquial es un tipo de respiración propia de la mayoría de los animales acuáticos y se lleva a cabo en las branquias, unas estructuras con forma de láminas que contienen vasos sanguíneos. Los animales acuáticos dispone de estos órganos que permiten absorber el oxígeno que se encuentra en el agua y eliminar el dióxido de carbono.

El agua que entra por la boca y circula por las branquias, donde el oxígeno es absorbido, pasa a la sangre y es transportado a todo el cuerpo donde se produce una respiración celular.

Es decir, <em><u>en los seres vivos acuáticos el oxigeno es tomado del agua y penetra a la célula por el fenómeno de respiración branquial.</u></em>

5 0
3 years ago
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