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Mekhanik [1.2K]
3 years ago
13

How many african americans are carriers of the sickle cell disease?

Biology
2 answers:
Sphinxa [80]3 years ago
6 0
I do believe it would be around 1 million dont quote me on it though 
mote1985 [20]3 years ago
3 0
Millions of Africans
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Using at least 3 steps explain how to make a wet mount slide with an Elodea plant​
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Step One - Obtain a clean microscope slide.

Step Two - Place a drop of liquid on the slide. This is the “wet” part of the wet mount. The liquid used depends on the type of cell being viewed:
If examining a plant cell, tap water can be used.
If examining an animal cell, physiological saline (or contact lens solution) must be used, because if plain water is used, the cell will explode from osmotic pressure. Unlike plant cells and bacteria, animal cells have no cell wall to structurally support them.

Step Three - Obtain the specimen to be used. Some introductory biology classics for viewing include:
Skin of an onion bulb: In order to view the cells, a very thin layer of skin must be obtained. Take a single layer of onion and bend it towards the shiny side. After it snaps, pull gently, and a transparent layer of skin, similar to Scotch tape, will appear.
Elodea leaf: Elodea leaves are two cell layers thick. The cells in one layer are smaller than the cells in the other, so elodea leaves can be used to better understand a microscope's depth of field.
Cheek cells: Human epithelial cells can be obtained by gently rubbing a toothpick on the inside of the mouth, and then swirling the toothpick in the physiological saline on the slide.
Pond water: Obtaining some water from a pond makes wet mount preparation a breeze, since the water and the specimens are both included.
Hope this helps
8 0
3 years ago
In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (r). The heterozygous
Sophie [7]

Answer:

2/4

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4 0
3 years ago
Prokaroytic and eukarayotic cells
asambeis [7]

Answer:

A prokaryote is a cellular organism that lacks an envelope-enclosed nucleus. The word prokaryote comes from the Greek πρό and κάρυον. In the two-empire system arising from the work of Édouard Chatton, prokaryotes were classified within the empire Prokaryota.Eukaryotic cells are cells that contain a nucleus and organelles, and are enclosed by a plasma membrane. Organisms that have eukaryotic cells include protozoa, fungi, plants and animals. These organisms are grouped into the biological domain Eukaryota.

Explanation:

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Komok [63]

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4 0
3 years ago
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Alex787 [66]

Answer:

The dihybrid ratio we expect in the offspring is 9:7.

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