Question

g. a cell has a single line of chromosomes. what is the phase?
h. during which three phases are individual chromosomes no longer visible?
4 think and discuss: why is it important that the cells dna is duplicated before cell division?
5 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.

Explanation:

• G: In metaphase of cell - division, chromosomes line up in a single line at the equatorial plate.
• H: Individual chromosomes are not visible during interphase (G1, S, G2), prophase (chromosomes start to condense but not clearly visible initially), and telophase (chromosomes de - condense).
• 4: DNA duplication before cell division ensures that each new cell receives a complete set of genetic information, maintaining genetic stability and proper cell function.
• 5: At the end of cytokinesis, each human cell will have 46 daughter chromosomes. During mitosis, the 46 original chromosomes duplicate to form 92 chromatids. These chromatids separate during anaphase, and after cytokinesis, each new cell gets 46 daughter chromosomes to maintain the diploid number.

Answer:

• G: Metaphase
• H: Interphase, Prophase, Telophase
• 4: To ensure each new cell has a complete set of genetic information.
• 5: 46. During mitosis, 46 original chromosomes duplicate to 92 chromatids which separate, and each new cell gets 46 daughter chromosomes to maintain the diploid number.