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enyata [817]
2 years ago
8

Scientists have determined that lactase persistence evolved independently in European and African populations. What do these pop

ulations have in common that could result in lactase persistence in both populations?
Biology
1 answer:
Snowcat [4.5K]2 years ago
5 0
It's the lack of milk in a person's diet many people in Africa can't afford milk. That's the best I can do, I don't know the subject very well

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The wind stirs up _<br> currents.
SIZIF [17.4K]
The answer should be surface.
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3 years ago
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If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of t
REY [17]

The question is incomplete. The complete question is:

Question: If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?

A) Backtrack through her previous experiments to obtain another plant with the same traits.  

B) Breed this plant with another plant with much weaker traits

C) Clone the plant asexually to produce an identical one

D) Force the plant to self-pollinate to obtain an identical one.

Answer:

C) Clone the plant asexually to produce an identical one

Explanation:

Asexual reproduction is a mode of production of progeny from a single parent. It does not include the fusion of male and female gametes. Therefore, the progeny obtained from the asexual reproduction is genetically identical to the parent plant and is called a clone. One of the methods of asexual reproduction in plants includes vegetative propagation.

To maintain desirable traits in progeny, one must perform asexual reproduction in the single parent plant with such traits. The asexual reproduction would produce the progeny having all the desirable genetic traits as that of the parent plant.

6 0
3 years ago
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Lipids in a bilayer can diffuse laterally at a relatively fast rate, but \"flip-flop\" from one leaflet to the other very slowly
natima [27]

Answer:

  • flippases translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet,
  • floppases, move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet, ABC transporter, move phospolipids across the lipid bilayer down the concentration gradient
  • scramblases Not ATP-dependent, Activation may result in increased membrane lipid symmetry, translocate phosphatidylserine,  preventing apoptosis and engulfment by macrophages,  

Explanation:

Flipases are transportes that require energy for their functioning (ATP dependent) beause they move phospolipids across the lipid bilayer against the concentration gradient  (from extracellular side to cytosolic side).

Floppases are ABC transporters, opposite than flippases (move phospholipids from the cytosolic side).

Scrablases are bidirectional transporters, responsible for asymmetry formation. It also enables exposure of phosphatidylserineon the outer leaflet when it is necessary.

6 0
3 years ago
The process which causes potholes in roads is called ______ when it occurs under glacial ice
Fofino [41]

Answer:

Expansion and Contraction of underneath or base water

Explanation:

When ice lands on a road, it weakens the soil beneath the pavement, cement by expansion. The slight varying temperatures that leads to the combination of contraction and expansion affects road this leading to potholes on road.

4 0
4 years ago
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Discuss factors that can lead to speciation
Artemon [7]

Answer:

Mate choice, competition, and the variety of resources available are the key factors.

Explanation:

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