What does trophic level mean in ecosystem

1 answer:

4 0

The trophic level is a class of organisms in the food chain.
In a food chain, it starts with the sun, food chains ALWAYS starts with the Sun. The next part of the chain is the producers who use the Sun's energy. The Producers are flowers, grass, and trees. Next, comes the Primary Consumers that eat the producers, they can be grasshoppers, and rabbits. Next animal in the chain is the Secondary Consumer that eats the Primary one, they are foxes and birds. Then, the Tertiary Consumers that eat the Secondary ones, they are snakes and coyotes. And lastly are the Quaternary Consumers that are the top predators. Quaternary Consumers are Hawks, Wolves, Bears and so on.

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Why do calculated recombination frequencies between pairs of loci that are located far apart underestimate the true genetic dist

den301095 [7]

Answer:

B. As the distance between loci increases, some multiple crossovers go undetected such that the relationship between recombination frequency and map distance ceases to be linear.

Explanation:

When calculating recombination frequencies, and hence, map distances, we might notice that these distances are not completely additive. They might vary. For example, let us say that we have three genes, A, B, and C, in that order. We calculated that the distance between A and B equals 5.9 MU and that B and C are 19.5 MU apart. According to this, we might say that the total distance between A and C is 25.4 MU (5.9 + 19.5). However, after a two-point calculation between A and C, the value equals 23.7 MU.

The recombination frequency between these two genes located in the extremes and far apart underestimate the actual genetic distances between them because there might occur other crossing-overs that were not detected. This is when calculating the distance between A and C, we probably will not detect the occurrence of a double recombinant between them, and hence, we might sub-estimate the real distance.

The relationship between the actual map distance (number of crossing overs) and the recombination frequency between two loci, is not lineal. The farther apart are the two genes, the worse is the distance estimation.

8 0

3 years ago

Which of the statements regarding enzymes is FALSE? *

Lynna [10]

Answer:

Enzymes can only be used once

Explanation:

Enzymes are there forever

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3 years ago

Which organism is likely to live on the stump of a dead tree in a cool, moist, shady forest?

nydimaria [60]

Would it be fungi or not

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3 years ago

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Using the 10% rule when studying trophic pyramids, if the autotrophs produce 100 Joules of energy, how much energy is passed on

Inessa [10]

Answer:

The answer is B.

Explanation:

It's Because 10% of 100 is 10.

6 0

3 years ago

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Inject DNA or RNA into the nucleus of a cell to reproduce.

kaheart [24]

The answer is A, Viruses

Viruses cannot reproduce on their own , so they have to inject their DNA or RNA into the nucleuus of a cell. By doing this, the virus will take over that cells and within times, that cells will pop up and producing more viruses.

This reproduced virus will repeat the same process until our immune systems stop them

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3 years ago