Awhite-eyed female drosophila is crossed with a red-eyed male drosophila. which statement below correctly describes the results?
a) none of the females will have white eyes.
b) fifty percent of the females will have red eyes.
c) twenty-five percent of the females will have red eyes.
d) none of the females will have red eyes.
e) twenty-five percent of the females will have white eyes.

The correct answer is d) None of the females will have white eyes.

Explanation:

When talking about genetics, you will always hear mentioning the genotype that is the genetic composition inherited from the parents and the phenotype that are the observable characteristics such as eye color.

In the Drosophila experiment, where a white - eyed female crosses a red - eyed male, it can be seen that none of the females will have white eyes.

This is because the characteristic of white eyes is a mutation, and the mutations are generally recessive. The red color gene is on the X chromosome so that the red - eyed male will pass that characteristic to his daughters. And from their mother, they will receive an X chromosome of the white carrier, since the gene of the recessive white color will prevail the red color as the dominant gene.

I hope this information can help you.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.