AP BIOLOGY

Detailed explanation-1: -Metaphase is the stage of the cell division during which the chromosome is present in the highly condensed form present in the centre of the cell. The chromosomes are aligned at the equator of the cell. Thus, metaphase is the correct answer.

Detailed explanation-2: -Why is onion root tip used to demonstrate mitosis in this experiment? It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis.

Detailed explanation-3: -In order to examine cells in the tip of an onion root, a thin slice of the root is placed onto a microscope slide and stained so the chromosomes will be visible. The cells you’ll be looking at in this activity were photographed with a light microsope and then digitized so you can see them on the computer.

Detailed explanation-4: -For example, each human cell possesses 46 chromosomes, while each cell of an onion possesses 8 chromosomes.

Detailed explanation-5: -Final Answer: Onion is diploid with 16 chromosomes. During the cell cycle, the number of chromosomes at G1 and after S are 16 each. Also, after the M phase (after mitotic cell division), the number of chromosomes in each daughter cell is 16.