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Meiosis consists of two divisions (meiosis I and meiosis II) after DNA replication, producing haploid gametes.
Meiosis is a specialized type of cell division in sexually reproducing eukaryotes that produces gametes (sperm and eggs). It involves two successive rounds of division (meiosis I and meiosis II) after DNA replication, ultimately generating four daughter cells that are haploid—each containing one copy of each chromosome. In mammals, meiosis completes only after fertilization, when the final stages are resumed to form the zygote. The overall purpose of meiosis is to (1) reduce chromosome number by half so that fertilization restores the diploid state, and (2) create genetic diversity among offspring. This diversity arises because homologous chromosomes pair and exchange genetic information through homologous recombination and chromosomal crossover during meiosis I, producing new combinations of maternal and paternal genetic material in the resulting gametes.
Meiosis consists of two divisions (meiosis I and meiosis II) after DNA replication, producing haploid gametes.
Its main purpose is to halve chromosome number so fertilization can restore diploidy in the zygote.
Homologous recombination and crossover during meiosis I generate genetically unique gametes, increasing offspring variation.
A cell state with one copy of each chromosome (half the chromosome number of the diploid parent).
A cell state with two copies of each chromosome (one set from each parent).
The first meiotic division that separates homologous chromosomes and reduces chromosome number by half.
The second meiotic division that separates sister chromatids, producing four haploid cells.
A programmed exchange of DNA between paired homologous chromosomes that creates new genetic combinations.
A reproductive cell (sperm or egg) produced by meiosis that carries a haploid set of chromosomes.
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