AP BIOLOGY

Detailed explanation-1: -In this example, a diploid body cell contains 2n = 4 chromosomes, 2 from mom and two from dad.

Detailed explanation-2: -Germ cells (sperm and egg) are haploid, meaning that during meiosis, the chromosome number doubles to 4N, then divides into 2N, and divides again into 1N. N is the number of chromosome types in the animal. The stages of mitosis and meiosis will be discussed later.

Detailed explanation-3: -Prophase I: The starting cell is diploid, 2n = 4.

Detailed explanation-4: -Meiosis I is unique in that genetic diversity is generated through crossing over and random positioning of homologous chromosomes (bivalent chromosomes). In addition, in meiosis I, the chromosomal number is reduced from diploid (2n) to haploid (n) during this process.