The given question is incorrect. The correct question is as follows:
Consider a locus with two alleles - B and b. B is dominant, while b is recessive. There is no mutation. B has a selective advantage relative to b, so that the fitnesses of the three genotypes are BB = 1, Bb = 1, and bb = 1-s. In this case, s = 0.50, so that bb homozygotes have 50% fitness of heterozygotes and BB homozygotes. If the population has the following genotypic counts prior to selection of BB = 500, Bb = 250, and bb = 250, what is the frequency of B after one generation with selection? Please give your answer to two decimal places.
Answer:
0.63
Explanation:
According to hardy Weinberg equilibrium the frequencies of the population remains stable from one generation to the next generation unless no selection or mutation is experienced by the population.
The frequency of B after one generation with selection can be calculated as follows:
Given, BB = 500, Bb = 250, and bb = 250.
Frequency (B) = 2 × BB + Bb / 2 × total number of individual.
Frequency (B) = 2 × 500 + 250 / 2 × 1000.
Frequency (B) = 1250 / 2000 = 0.625 = 0.63.
Thus, the frequency of B in population is 0.63.
<span>Here are the missing options for the above question:
</span><span>1. The bacterial culture in test tube D was diluted so much that no pink bacteria were left in the sample.
2. The pink bacteria were not able to get enough energy from the nutrient broth in test tube D to live.
3. The white bacteria outcompeted the pink bacteria for the nutrients in the broth in test tube D.
4. The pink bacteria are sediment growers in nutrient broth and the micropipette could not reach them.
</span><span>
It was about Spread Plate Method of Isolation with nutrient broth. Therefore the best answer choice is:
</span><span>1. The bacterial culture in test tube D was diluted so much that no pink bacteria were left in the sample.</span><span>
</span>
An object will remain at rest until an unbalanced force acts upon it, this basically means that if someone were to kick a still soccer ball, then it shall move from its resting place :)
Although there's plenty of nitrogen in the air, it's not in a form plants can use. They can only absorb nitrogen in the form of ammonium, nitrite, and nitrate. One way plants have access to these forms of nitrogens is decomposition of organic matter by soil organisms. Another source of usable nitrogen are mutualistic relationships between plants and bacteria. By providing nitrogen-fixing bacteria a place to live and feeding them with carbohydrates, plants get nitrogen in the form of ammonium. Plants that can do this include most legumes which form relationships with Rhizobium bacteria, and other plants like alder, bayberry, California lilac, and Russian olive that support Frankia bacteria on their roots.
There are also free-living nitrogen-fixing bacteria, as well as cyanobacteria that grow on the surface of plants or the soil, that add small amounts of plant-usable nitrogen to the soil. Lightning also generates usable nitrogen compounds.
Chemical fertilizer is a major source of plant-usable nitrogen. But other human activities, like the burning of fossil fuels and livestock operations, inadvertently produce widespread, nitrogen-enriched rainfall.
