Asample of ocean water is tested for its bacterial content in a plate count assay. a one-milliliter sample of the water is diluted in a 1: 10 dilution series. 0.1 milliliter of the second dilution tube is plated in a pour plate. after incubation, the plate has 191 colonies, indicating that the original water sample

191000 cells per millilitre

Explanation:

After incubation the plate has 191 colonies. Since each colony grows from a single cell, the plate had 191 cells.

Now only 0.1 millilitre was plated from 1 millilitre of sample hence number of cells in 1 millilitre of sample is 10 * 191 = 1910 cells.

It has been given that this sample is taken from second dilution tube of 1:10 dilution series. So total dilution here has been of 100 times. Hence, original water sample contained 1910 * 100 = 191000 cells per millilitre.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.