AP BIOLOGY

Detailed explanation-1: -After undergoing one round of DNA replication, the cell appears to be dividing without further replicating its DNA. Which process is the cell most likely undergoing? the centromeres of sister chromatids separate.

Detailed explanation-2: -If cells don’t replicate their DNA or don’t do it completely, the daughter cell will end up with no DNA or only part of the DNA. This cell will likely die. So this process of duplicating DNA is very important.

Detailed explanation-3: -Meiosis begins with a parent cell that is diploid, meaning it has two copies of each chromosome. The parent cell undergoes one round of DNA replication followed by two separate cycles of nuclear division.

Detailed explanation-4: -DNA replication occurs in both mitosis and meiosis. In meiosis, the cell undergoes two divisions, i.e. meiosis I and II. Meiosis I is reduction division and meiosis II is similar to mitosis but DNA replicates only once during meiosis, i.e. before meiosis I in S phase.

Detailed explanation-5: -(B) In meiosis, two chromosome-segregation phases, meiosis I and meiosis II, follow a single round of DNA replication during the premeiotic S phase. During meiosis I, homologous chromosomes (shown in red and blue) are segregated to opposite poles.