Understanding Chromosome Numbers in Mitosis and Meiosis

The video explains chromosome numbers in mitosis and meiosis, focusing on human cells. It covers chromosome structure, the role of centromeres, and the process of interphase where chromosomes duplicate. In mitosis, cells divide to produce two identical cells with 46 chromosomes each. In meiosis, cells undergo reduction division, resulting in four cells with 23 chromosomes each. The video emphasizes the importance of understanding chromosome counting and the definition of chromatids.

What is the chromosome count in human body cells?

• 92

• 46

• 23

• 12

What is the chromosome count in human gametes?

• 92

• 23

• 12

• 46

What is the primary function of the centromere during cell division?

• To duplicate DNA

• To condense DNA

• To attach spindle fibers

• To separate chromatids

What is the role of chromatids during cell division?

• To create proteins

• To provide energy

• To form the cell membrane

• To ensure DNA is passed to new cells

During interphase, what happens to the chromosomes?

• They disappear

• They are halved

• They are duplicated

• They remain unchanged

How many chromatids are present after chromosome duplication in interphase?

• 12

• 92

• 46

• 23

In mitosis, how many chromosomes are present in each daughter cell?

• 92

• 46

• 12

• 23

What is the key difference between mitosis and meiosis in terms of chromosome number?

• Meiosis results in identical chromosome number

• Mitosis results in identical chromosome number

• Meiosis results in cells with double the chromosomes

• Mitosis results in cells with half the chromosomes

At the end of meiosis I, how many chromosomes are in each daughter cell?

• 23

• 46

• 92

• 12

What is the result of meiosis in terms of chromosome number in daughter cells?

• Triple the original cell

• Half the original cell

• Double the original cell

• Same as the original cell