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tino4ka555 [31]
3 years ago
12

why the frequency of sickle cell trait is so much higher in sub-Saharan Africa than in most other parts of the world?

Biology
1 answer:
Maksim231197 [3]3 years ago
3 0
Because they have less resources to fight off disease and nothing to use for immunity. Sub Sahara Africa is also very poor
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Which of the following tissues, cells, or structures in flowering plants is a part of the sporophyte generation and therefore di
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Answer:

Cell of and integument

Explanation:

When flowering plants reproduce by sexual reproduction, they form seeds contained into fruits. The fruit is derived from the maturation of the flower's ovary (female part) after fertilization.

A mature seed contains three generations:

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  3. All the above structure is in turn surrounded by the seed coat (diploid parental sporophyte tissue). The seed coat is produced by integument cells to protect the embryo during its development and before its can germinate. As it is produce by it parental plant, its ploidy level diploid.

In contrast, the generative nucleus and sperm cell are part of male gametophyte (pollen grain) and therefore haploids. Synergid cell is part of embryo sac, therefore belongs to female gametophyte and thus being haploid. Finally, cell of endosperm is usually derived from the fusion between a sperm cell and one of the two female gametes present within the embryo sac, thus being triploid.

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