Why is different air pressure important?

2. Imagine a population of crabs living on a white sandy beach. The crabs ONLY occur in two colors- red and blue, each controlle

Whitepunk [10]

Natural selection benefits individuals with better fitness, increasing their frequency in populations. In the exposed example, white individuals can camouflage better from predators and get to survive and reproduce.

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Natural selection is the result of the phenotype-environment interaction which determines gene destiny in space and time, selecting beneficial alleles and increasing their frequency in the population.

Natural selection results in adaptation, which means the increase of the aptitude phenotype. Aptitude is the contribution of each genotype to the next generation.

Aptitude (or fitness) is the phenotype that results in the survival, fertility, and capability of having a mate. 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.

In many cases adaptations, resulting from natural selection can be correlated to environmental factors or selective pressures applied by other organisms or the habitat.

In the exposed example, color differences between the substrate and the crabs' bodies make them more vulnerable to the attack of predators. If this is the case, predators are acting as selective pressure or modeling environmental factor.

Red and blue crabs probable are easily seen against a white sand substrate. So the crabs' population exhibiting these colors suffer from high predation pressure.

Individuals expressing white color can camouflage better and are not seen by predators. Hence, they get to survive more in comparison with colored individuals. So crabs' response to the selective pressure is survival of white or clear individuals.

Natural selection benefits white individuals, who manage to survive and reproduce, expressing a higher fitness. The white color trait begins to spread into the whole population, and finally, it shifts towards white.

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3 0

3 years ago

A hypothetical bat species (species 1) lives in a city. Another hypothetical bat species (species 2) established a population in

nikitadnepr [17]

<h2>B) is the correct option </h2>

Explanation:

In the given hypothetical condition roosting areas in buildings of any height are the fundamental niche of both bat species

Niche is the role played by an organism that how they can live in an environment including their diet and shelter
Fundamental niche represents all the environmental conditions where a species is able to live or can live
There is no ecological barriers in case of this type of niche
Since both bat species 1 and 2 can roost in buildings of any height this means there is no ecological barrier and heights of building represent all the conditions where bat species can live so it clearly represents fundamental niche

3 0

3 years ago

When O2 binds to heme in hemoglobin, the ion is drawn into the plane of the porphyrin causing a conformational change that is tr

Varvara68 [4.7K]

Answer: Fe2 ; affinity

Explanation:

Hemoglobin is the specialised protein which are present in red blood cells which gives it the ability to carry oxygen to the tissues and return carbondioxide from the tissues to the lungs.

The hemoglobin is made up of

--> a heme group: this consists of a ferrous iron ( Fe2) and a surrounding porphyrin ring.

--> globin.

As the haemoglobin molecule loads and unloads oxygen (O2) the individual globin chains in the hemoglobin molecule move on each other. When oxygen is unloaded the beta chains are pulled apart, permitting entry of the metabolite 2,3-diphosphoglycerate resulting in a lower affinity of the molecule for oxygen and higher affinity for carbondioxide.

Also, when the partial pressure of oxygen (PO2) in the blood is high, the beta chains move close together, O2 binds to heme in hemoglobin, the ion Fe2 is drawn into the plane of the porphyrin causing a conformational change that is transmitted to adjacent subunits enhancing the AFFINITY for additional O2 binding.

4 0

3 years ago

What event happens first in the development of new organisms?

Rom4ik [11]

Well a sperm fertilizes an egg to form a zygote.

7 0

3 years ago

What is the right term of bacterial chromosome: a)nuclear material b)plasmid c)message d)nucleus

lakkis [162]

Answer:

B) Plasmid

Explanation:

Plasmids are the correct terms to call bacterial chromosomes by.

These plasmids are the chromosomal DNA which prokaryotes, like bacteria, have.

This is because they do not have nuclei, which eukaryotes do. This makes answer choices A and D wrong because they involve the nucleus.

Answer choice C is also wrong because it is not the term to call bacterial chromosomes, although plasmids do contain messages.

So, answer choice B is correct.

8 0

3 years ago