28. The model below shows what happens to chromosomes during a certain part of the cell cycle. Why is this step in the cell cycle important for maintaining a functioning organism?
1 chromosome
1 chromosome
(before mitosis)
(after replication)
centromere
1 chromatid
per chromosome
2 chromatids
per chromosome
a. Each cell needs a complete set of organelles in order for the cell to work properly
b. Copying the DNA provides more instructions so the cell can work more efficiently
C. Each cell needs to receive a complete copy of the chromosomes in order for the cell to work
properly
yes

C. Each cell needs to receive a complete copy of the chromosomes in order for the cell to work properly

Explanation:

The model in this question depicts the process of DNA replication, which is the process whereby an identical copy of DNA is made. Based on the model in the question, one (1) individual chromosome forms two (2) sister chromatids per chromosome. Each sister chromatid contains the replicated DNA.

This process is very important and must occur prior to any cell division because every cell needs to receive a complete copy of the chromosomes in order for the cell to work properly. For example, each human cell must receive 23 pairs of chromosome or 46 chromosomes in order to function well and this is ensured by DNA replication.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.