Biologists have proposed that the use of antibiotics to treat hum...

Question

Biologists have proposed that the use of antibiotics to treat human infectious disease has played a role in the evolution of widespread antibiotic resistance in several bacterial species, including Staphylococcus aureus and the bacteria causing gonorrhea, tuberculosis, and other infectious diseases. Explain how the evolutionary mechanisms mutation and natural selection may have contributed to the development of antibiotic resistance.

Accepted Answer

Hello everyone and welcome to today's video. So in a population of rabbits, the AO for black fur, uppercase B is dominant over the allele for white fur, which is lower case B. So if 75% of rabbits have the dominant ali upper case B, what is the frequency of the heterozygous individuals in the population? As answer choice A we have 0.275 as answer choice B we have 0.350 as answer choice C we have 0.250. And as answer choice D, we have 0.375. Now, in order to solve this problem, we really need to go back to our Hardy Weinberg equation which is going to be the P square plus two P Q plus Q square is going to be equal to one. Now, we are told that 75% of rabbits have the dominant. Now this is going to be in our other form of the Hardy Weinberg equation P plus Q equals to one. This dominant A is going to be represented by P. So we have that 0.75 plus Q is going to be equal to one. If we solve for Q, we see that Q equals one minus 0.75 Q is equals 0 to 0.25. So we have that P is 0.75 that Q is 0.25. And we are asked for the frequency of heterozygous individuals in the population. This is given by two times P times Q in a Hardy Weinberg equation. So all we need to do is solve for two P Q in order to obtain the frequency of heterozygous individuals in the population. Let's do that. Now, we have that too times 0. times 0.25 is going to be this frequency. If we make this calculation, we're going to obtain the number zero point 3 75 or 375 this is going to be the frequency of these heterozygous individuals in the population which is going to be answer choice D 0.375. I really hope it's helped and I hope to see you on the next video.

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