A Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test. A sterile environment helps to avoid contamination.

When a test is conducted and it shows the presence of a red or red-violet color in the surface alcohol layer it means the result is positive

But when the colour is yellow it indicate negative reaction due to glucose fermentation.

A deviation from two color may also occur when we have an orange color. This colour change is due to the presence of methyl indole

When there is no color change this indicate No decarboxylase which is an enzyme needed for the fermentation reaction.

Color changes are indicator of how successful the reaction was.

4 0

3 years ago

e) The allele for small size is recessive, and the allele for normal size is dominant. The frequency for the normal-size allele

ki77a [65]

Answer:

51.84%

Explanation:

p² + 2pq + q² = 1 and p + q = 1

p = frequency of the dominant allele in the population

q = frequency of the recessive allele in the population

p² = percentage of homozygous dominant individuals

q² = percentage of homozygous recessive individuals

2pq = percentage of heterozygous individuals

p = 0.72 => p² = 0.72² = 0.5184

=> Percentage of the rats are normal sized: 51.84%

3 0

2 years ago