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VashaNatasha [74]
3 years ago
7

Nitrogen cycle start to finish

Biology
1 answer:
morpeh [17]3 years ago
5 0
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. ... Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
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A couple has three children, two without sickle cell anemia and one with sickle cell anemia. The mother has sickle cell anemia a
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Answer:

Explanation:

The sickle cell allele is recessive. Hence, in order for any child of the couple to have sickle cell anemia, such a child will have to inherit an affected allele each from the two parents. This means that both the father and the mother must have affected alleles in their genotypes. In other words, two sickle cell alleles are required for the abnormality to manifest.

Let us assume that the sickle cell allele is represented by S and the normal allele is represented by A.

Now, it is established that the mother has sickle cell anemia, her genotype would be SS. The father does not have sickle cell, his genotype can either be AA or AS.

Assuming the genotype of the father is AA:

          SS   x   AA

      AS   AS   AS   AS

<em>All the children would be normal in this case.</em>

Assuming that the genotype of the father is AS

           SS    x    AS

      AS   SS   AS   SS

<em>50% of the children would have sickle cell while the remaining 50% would be normal.</em>

<u>Therefore, in order to produce children with sickle cell, the father has to be AS, otherwise, he has to be AA.</u>

<u><em /></u>

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3 years ago
What are the colors of the siberian wood frog?
Nana76 [90]
Brown tan or rusted colored
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3 years ago
In the female, the development of the "egg" halts during TWO stages, _________ and __________
earnstyle [38]

Answer: The blanks can be correctly filled up with prophase I and metaphase II.

Explanation:

In females, finite number of oocytes are present since birth. The process of oogenesis initiate in embryonic stage only. However, oogonia divide and mature to form primary oocytes. These primary oocytes start meiotic division but arrest in prophase I stage before birth.

After a girl attains puberty, one primary oocyte resumes its division each month during a menstrual cycle. The primary oocyte divides to form secondary oocyte and polar body.

Polar bodies degenerate after completing meiosis II. However, secondary oocyte halts its division again at metaphase II until fertilization takes place. Once fertilization takes place it completes its meiosis II and results into mature ovum and polar body.

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The prenatal development of the internal reproductive structures of the male requires _______ select one:
Ilya [14]
The prenatal development of the internal reproductive structures of the male requires the <span>secretion of androgens.</span>
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Select the best answer for the question.
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Answer:D

Explanation:

Because the plant would get alot of light

The plant needs carbon dioxide to live and moderate temp because its not to hot and not to cold

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