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atroni [7]
3 years ago
13

After hundreds or even thousands of generations both alleles for sickle cell anemia are still common in those of african ancestr

y. how would you explain this?
Biology
1 answer:
zhannawk [14.2K]3 years ago
8 0
After hundreds or even thousands of generations both alleles for sickle cell anemia are still common in those of African ancestry. This is supported by two mechanisms: heterozygote advantage and gene flow.

Heterozygote advantage
When an allele is said to be heterozygous, it is carrying one copy of a gene. For example if one carries a copy of sickle cell allele, it will stay in the population even after many generations — natural selection will not be able to remove it and it will be passed on through generations. So, having one copy of that allele is advantageous but not deleterious.

Gene flow
With humans migrating throughout the different parts of the world, sickle cell allele is passed from one person to another or in different populations. It is actually advantageous to have one copy of this allele especially if there’s malaria in the area, which the allele is resistant.
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Answer:

Giant Dragonfly - 2.5 FEET

Modern Dragon Fly - 1-4 Inches.

Explanation:

Size Difference in Percentage: The Giant Dragonfly is 250% - 160% bigger than the Modern Dragonfly.

6 0
3 years ago
What is the result of a mutation during meiosis?
galina1969 [7]

Answer:

A mutation is a change in the nucleotide sequence of the DNA in a cell. ... Mutations can occur before, during, and after mitosis and meiosis. If a mutation occurs in cells that will make gametes by meiosis or during meiosis itself, it can be passed on to offspring and contribute to the genetic variability of the population.

Explanation:

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4 0
3 years ago
HELP!!! We are going to ask the question: How does moving the fulcrum point effect the distance a nickel can fly?
suter [353]

Answer:

more force needed would be fulcrum at 12 with nickle at 1 the one closest to the nickle would go the furthest

3 0
3 years ago
Read 2 more answers
Will a female only inherit a sex linked disorder if her father suffers from the same disorder, and if her mother is a carrier fo
muminat

Answer:

The female will not inherit a sex linked disorder if her father suffers rather "have chances or the disorder if the mother is the carrier" for the disorder.

Explanation:

A female has 2 X chromosome, which she got from her parents each. The females will get the disorder or the defective gene if the mother has defective X chromosome or if the father is carrying the same disorder from his father(grandfather). In both the cases the female will be the carrier and have chances to inherit the defect to the offspring. But the female will  not affect as the  male will. As the female has 2 X chromosomes, and hence the dominant X will compensate for the error in recessive X.

5 0
3 years ago
Mr. Shepherd is at a football game on a cold day. How does his body maintain a relatively constant body temperature? What is thi
jok3333 [9.3K]

Answer:

1. Mr. Shepherd maintain a relative constant body temperature by preventing loss of heat.

2 This process is called HOMEOSTASIS

Explanation:

Homeostasis is the process whereby living organisms maintain a stable internal environment despite changes in conditions to the external environment. It is necessary that the body undergoes this process in order to guarantee survival.

According to this question, Mr. Shepherd is at a football game on a cold day. This means that in order to maintain a stable internal temperature, the body must preserve heat in the body and prevent its loss via sweating.

6 0
2 years ago
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