how do scientists develop scientific explanations about subjects that are impossible to study through controlled experiments?

2 answers:

7 0

There are many ways to do this. You can either create a close approximation to what you think are the most relevant variables and hope your idea about the relevant variables was true.

Another way would be to do different kinds of experiments and hope you can deduce information from those experiments onto the subject that you would like to find an explanation for.

Nataly [62]2 years ago

6 0

By following the steps of the scientific meathod

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pantera1 [17]

Give brainiest answer Cus like look at my answer
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A man who smokes heavily has developed lung cancer. The tobacco smoke has caused mutations in some of the cells in his lungs, ma

Naya [18.7K]

Answer:

The correct answer is: B. If he inherited a mutation which made him more susceptible to lung cancer, it may have been present in some of the gametes he produced and passed to his children.

Explanation:

The inheritance of genes from the parents to the offspring is mediated by the germinal cells or sex cells or gametes of the parents.
The genetic material present in the somatic cells of the parents are not transmitted to the offspring.
In the given case, the man who develops lung cancer generates some tobacco smoke induced mutations in some of the cells of his lungs.
The cells of the lungs are type up of somatic cells. Hence, any mutations in the genome of these cells will never be transmitted to the offspring.
Therefore, the children of the man will never become prone to develop lung cancer due to development of mutations in the lung cells of the man.
However, if the man has inherited any mutation from his parents which can increase the risk of development of lung cancer, then these mutations will be present in his germinal cells and also in some of his gametes.
Now, if a child is born due to the fusion of the the maternal gamete with one of these mutated paternal gametes, there is an increased chance of developing lung cancer in the child, irrespective of the fact whether he is a smoker or a non-smoker.

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2 years ago

The frequency of q in a population is 0.05. What is value of 2pq in the equation (the frequency of the heterozygous genotype)? 0

svetlana [45]

Your answer will be 0.095. :)

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Which statement best describes the nature of science

julia-pushkina [17]

C. <span>Scientific ideas change over time as new information is discovered.</span>

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After performing a gram stain of a mixed culture of gram positive and gram negative cells, you shout: "oops, i forgot the iodine

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Gram's staining is a differential staining technique that employs a primary stain like crystal violet and a counter stain like safranin along with the decolourizing agent alcohol and a mordant called the Gram's iodine.

Iodine is a mordant added after the primary stain. It fixes the stain by combining with it to enchance the staining ability. This forms an insoluble crystal violet iodine complex appearing purple under the microscope. These microorganisms are classified as Gram positive.

If addition of iodine is skipped, crystal violet is not fixed on the slide and the insoluble complex is not formed. The cells are decolourized by alcohol and are stained by the counter stain safranin making the Gram positive cells wrongly indentified as Gram negative due to its pink colouration. Thus, the slide will show all the cells as pink coloured Gram negative cells.

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