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A diploid cell starts with 2N chromosomes and 2X DNA content. After DNA replication, the cells is still genetically diploid (2N chromosome number), but has 4X DNA content because each chromosome has replicated its DNA. Each chromosome now consists of a joined pair of identical sister chromatids.
From this process alone, one individual could, in principle, produce 2 n genetically different gametes, where n is the haploid number of chromosomes (Figure 20-8A). In humans, for example, each individual can produce at least 2 23 = 8.4 × 10 6 genetically different gametes.
10 Φεβ 2020 · At the end of meiosis and cytokinesis, four haploid cells are produced from a single diploid cell. These haploid daughter cells have half the number of chromosomes as the parent cell and are not genetically identical to the parent cell.
In meiosis, the starting nucleus is always diploid and the daughter nuclei that result are haploid. To achieve this reduction in chromosome number, meiosis consists of one round of chromosome replication followed by two rounds of nuclear division.
In meiosis, the starting nucleus is always diploid and the daughter nuclei that result are haploid. To achieve this reduction in chromosome number, meiosis consists of one round of chromosome replication followed by two rounds of nuclear division.
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells.
31 Δεκ 2020 · Meiosis is a process of cell division in eukaryotes characterized by: two consecutive divisions: meiosis I and meiosis II. no DNA synthesis (no S phase) between the two divisions. the result: 4 cells with half the number of chromosomes of the starting cell, e.g., 2n → n. Fusion of two such cells produces a 2n zygote.
