Question

the model shows what happens to chromosomes during a certain part of * 5 points the cell cycle. which of these is a reason that the chromosomes in the cell have two chromatids? 1 chromosome (before mitosis) 1 chromosome (after replication) centromere 1 chromatid per chromosome 2 chromatids per chromosome it allows the cell to divide into genetically identical daughter cells. each chromatid contains unique genetic information it allows genetic information to cross over between sister chromatids during mitosis, increasing genetic diversity. a chromosome requires two chromatids to initiate protein synthesis.

Explanation:

• Option 1: During the S - phase of the cell cycle, DNA replication occurs. Each chromosome (which initially has one chromatid) is replicated to form two sister chromatids. When the cell divides (in mitosis), these sister chromatids are separated. Each daughter cell gets one chromatid (now a chromosome in the daughter cell) from each pair of sister chromatids. Since the sister chromatids are identical (because they are formed by DNA replication), the daughter cells are genetically identical.
• Option 2: Sister chromatids (the two chromatids of a replicated chromosome) are identical (assuming no mutations). They do not contain unique genetic information.
• Option 3: Crossing - over occurs in meiosis (not mitosis) between non - sister chromatids of homologous chromosomes. In mitosis, there is no crossing - over between sister chromatids that would increase genetic diversity.
• Option 4: Protein synthesis is initiated by the process of transcription (DNA to RNA) and translation (RNA to protein). A single - chromatid chromosome (before replication) can also undergo transcription to initiate protein synthesis.

Answer:

It allows the cell to divide into genetically identical daughter cells.