Question

1. challenge: human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere. once the chromosome has split, each chromatid is called a daughter chromosome. at the end of cytokinesis, how many daughter chromosomes will be found in each cell? explain.

activity b: duration of phases
get the gizmo ready:

• click reset
• select the table tab

question: what is the relative duration of each phase of the cell cycle?

1. collect data: set the cycle length to 10 hours and click play. click pause when the maximum number of cells has been reached. on the table tab, click record data

record the number of cells in each phase of the cell cycle in the table below. then click play, wait for a while, and click record data again. repeat this process until you have recorded four sets of results, and then find the average number of cells in each phase (add up all 4 trials of each stage and divide by 4 = average)

Explanation:

Step1: Understand cell - division process

During mitosis, the 46 chromosomes (each with two chromatids) line up at the metaphase plate. In anaphase, the centromeres split and the chromatids separate to become daughter - chromosomes.

Step2: Determine number of daughter - chromosomes per cell

At the end of cytokinesis, which is the final step of cell division, the parent cell divides into two daughter cells. Since the parent cell had 46 chromosomes and each chromosome's chromatids separate to form daughter - chromosomes during anaphase, each daughter cell will receive 46 daughter - chromosomes.

Answer:

46