Biology Quiz

Describe the stages of mitosis given 2n=6 (STEM_BIO11/12- Id-f-7).

Enumerate and describe the phases of mitosis. Differentiate between haploid and diploid chromosome counts.

M Phase

Preparing for Mitosis: Cell cycle checkpoints check for errors.

Preparing for Mitosis: The synthesis phase involves the duplication of the cell’s DNA.

The Chromosome DNA in interphase is found in the form of chromatin which condenses during mitosis. Each chromosome is made up of two sister chromatids.

Haploid and Diploid Cells The human genome has 23 pairs of chromosomes for a total of 46 chromosomes in each cell. 23 is the haploid number whereas 46 is the diploid number. Haploid is often represented as n while diploid is 2n. The number of sets of chromosomes that a cell or an organism has is known as ploidy.

Haploid and Diploid Cells All human body cells are diploid except gametes which are haploid.

Mitosis is also divided into multiple phases.

The nucleolus disintegrates. The chromatin condense into chromosomes. The mitotic spindle starts to form.