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3 years ago

Why does the respiratory system need to pass oxygen to the blood?

Biology

2 answers:

Arisa [49]3 years ago

5 0

It's need to pass oxygen to the blood to the respiratory system work properly I think that the answer

Natalija [7]3 years ago

3 0

So that the oxygenated blood can go through the circulatory system and pass on the oxygen to the cells in the tissues; without it the tissues will die.

Hope this helps !

Photon

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Not just a woman, but any astronaut:

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3 years ago

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What role so decomposers play in the nitrogen cycle

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3 years ago

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Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago? multipl

Dominik [7]

The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).

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3 years ago

Suppose the human trait for freckles is controlled by a simple dominant and recessive relationship at one locus. Freckles, F, is

Dennis_Churaev [7]

Answer:

0.549 is the frequency of the F allele.

0.495 is the frequency of the Ff genotype.

Explanation:

FF or Ff genotypes determine freckles, ff determines lack of freckels.

In this class of 123 students, 98 have freckles (and 123-98= 25 do not).

If the class is in Hardy-Weinberg equilibrium for this trait, then the genotypic frequency of the ff genotype is:

q²= 25/123

q²=0.203

q= $\sqrt{0.2$

q= 0.451

q is the frequency of the recessive f allele.

Given p the frequency of the dominant F allele, we know that:

p+q=1, therefore p=1-q

p=0.549 is the frequency of the F allele.

The frequency of the Ff genotype is 2pq. Therefore:

2pq=2×0.549×0.451

2pq=0.495 is the frequency of the Ff genotype.

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3 years ago