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Marat540 [252]
2 years ago
14

The number of major histocompatibility (MHC) protein combinations possible in a given population is enormous. However, an indivi

dual in that diverse population has a far more limited array of MHC molecules because ________.
Biology
1 answer:
attashe74 [19]2 years ago
6 0

Answer:

The correct answer is "each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene".

Explanation:

In normal conditions, an individual has only two different alleles for a given gene: one inherited from his mother and the other from his father. However, this does not mean that among humans, there are only two different alleles for each gene. The major histocompatibility (MHC) genes are a clear example of this, since there are multiple combinations for each MHC class. For instance, there are 40 very similar alleles only for the HLA-B27 subtype.

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If speciation occurred solely because of changes in chromosome counts between the original parents (who were 2n) and the offspri
Ket [755]

Answer:

Yes...This is an example of speciation by natural selection

Explanation:

As we know that natural selection always promote those evolutionary changes that are necessary. Changes that happen in chromosome number always promote with a specie that is closely related to the parent specie and produce fertile off-springs. These new generations are most adaptable and can survive in the environment more efficiently than the previous ones.

Additionally, other than natural selection, speciation can also happen as a result of random mutations, genetic drift and by means of artificial selection as well. But the natural likelihood of all these is probably low as compared to that of natural selection.

8 0
2 years ago
What type of protist is heterotrophic and includes species whose cells can come together to form a slug that moves to a new habi
Reil [10]

Answer: Fungus like protists are heterotrophic and feed on organic matter.

Cellular slime mould is a species of fungus like protists that form slug.

Explanation:

Fungus like protists are heterotrophic and the feed on organic matter and mostly unicellular.

Cellular slime mould are protists belonging to class Dictyostelia. They are heterotrophic and decomposers that live on organic matter. When there is deterioration condition, the cells migrates together to form slugs and move to form new habitat. Some of the cells form stalk and others form spores.

8 0
1 year ago
What initiates an action potential on a muscle cell?
Afina-wow [57]
A change in membrane potential
8 0
2 years ago
Select the correct answer from each drop-down menu. Hilda and her family are going on a sailing trip this summer, and Hilda is e
Natalka [10]

Answer:

Hilda and her family are going on a sailing trip this summer, and Hilda is especially interested in spotting dolphins. In which zone of the ocean is Hilda most likely to spot dolphins? Hilda and her family are most likely to spot dolphins in the PELAGIC zone. To view shorebirds and crabs, Hilda should move towards the INTERTIDAL zone.

Explanation:

The Pelagic Zone

It is any water in an ocean or lake that can not be said to be positioned in proximity to the shore or in proximity to the bottom (the shore and the bottom are two distinct zones with a completely different properties.

Divisions of the Pelagic Zone

It can be grouped into subzones based on depth, we have the epipelagic, close to the top of the zone which as light been present, and the abyssopelagic, is nearer to the bottom with light being absent.

The intertidal zone

Its found between the high tide (upper limit) and low tide lines (lower limit), majorly on the beach at the water's edge.

The major attribute of the intertidal zone is that it is immersed with water at high tide and is in exposure to the air at lower limit. The intertidal zone is usually undergoing alterations leading to organisms that are uniquely adapted to strive there.

Organisms found in this zone are sea stars, crabs, mussels, barnacles, and various corals as they well situated to strive immersed in water and a region of their lives open air at lower limit.

5 0
2 years ago
Why must nations sometimes work together to solve environmental problems
Black_prince [1.1K]
Because some problems are not always small enough for one nation that can do it by themselves and need more helpo
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2 years ago
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