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Inessa [10]
3 years ago
11

Artificial selection only produces favorable results

Biology
1 answer:
astra-53 [7]3 years ago
5 0

Non-fluorescent calcein AM is hydrolyzed by intracellular esterases into the green fluorescent dye calcein, which can be used to quantify the number of viable cells.

https://www.creative-bioarray.com/support/calcein-am-cell-viability-assay.htm

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When many individuals with the same trait die before reproducing, what happens to the distribution of that trait in the populati
sattari [20]

Answer:

The distribution of that trait in the population will change, probably decreasing to near zero.

Explanation:

An evolutive force such as natural selection is acting on this population.

Natural selection is the result between the individual phenotype and the environment that determines the destiny of genes. It results in adaptation, which means the increase of the aptitude phenotype.  

Aptitude (or fitness) is reflected by the phenotype that results in the survival, fertility, and capability of having a mate. Aptitude is the contribution of each genotype to the next generation. It is a way of measuring the individual ability to leave fertile offspring. Aptitude must be significant to the natural selection act in its favor.  

Natural selection can act favoring an allele or against it, according to how it affects the fitness of individuals.

When many organisms in a population sharing the same trait die, this is because they did not have good fitness, so they were not adapted to the environment and its pressures. The alleles coding for that trait were not good for the fitness of the animals, so they do not get to survive.

These individuals die before reproducing, so they could not transfer their genetic charge to the following generation. Eventually, the alleles coding for the trait will decrease in the population, probably near zero. Natural selection is acting against this phenotype. Other alleles will be beneficiated, and their frequency in the population will increase.  

This change in alleles frequency is what we call adaptation.                  

   

5 0
2 years ago
Two factors that determine the rate of stream erosion
marissa [1.9K]
Factors that determine the rate of stream erosion-

➡️ Rainfall (more rain more erosion). ✔️

➡️water velocity ✔️

➡️shape, size and depth of channel ✔️

➡️stream capacity to transport eroded material, and the nature of the material being transported✔️

➡️Gradient (Steepness or slope) ✔️

➡️Discharge (Amount of water carried at a given time) ✔️

➡️Load (The materials carried by a stream)
Rainfall (more rain more erosion). ✔️

➡️Slope (the steeper the slope the faster the water will flow) ✔️

➡️Geology (if the bedrock is a soft silt it will erode faster than granite).✔️



7 0
3 years ago
If the white eye gene is located on drosophila’s X chromosome,( )could have white eyes in the offspring
RSB [31]
I think A because males have XY and females have XX but don’t count on it
6 0
3 years ago
Look carefully at the model. During a drought, there is less water available for the plants. There is less runoff and less infil
Pavel [41]

Answer:

During a drought, there is less water available for the plants. There is less runoff and less infiltration. During a drought, less water is returned to the atmosphere by the plants through transpiration, and there is a decrease in the plants' rate of photosynthesis.

3 0
3 years ago
Fish eat algae, organisms that makes their own food. Which types of organisms are present in the scenario?
Gala2k [10]

Answer:

Herbivores and autotrophs

5 0
3 years ago
Read 2 more answers
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