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Which stage of meiosis is characterized by homologous chromosomes pairing and crossing over?
A
Telophase I
B
Prophase I
C
Metaphase I
D
Anaphase I
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1
Understand the process of meiosis, which is a type of cell division that reduces the chromosome number by half, creating four haploid cells. It consists of two consecutive divisions: meiosis I and meiosis II.
Focus on meiosis I, where homologous chromosomes are separated. This division includes several stages: prophase I, metaphase I, anaphase I, and telophase I.
Learn about prophase I, the first stage of meiosis I. During this stage, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
Recognize that crossing over occurs during prophase I. This is a crucial event where non-sister chromatids of homologous chromosomes exchange genetic material, increasing genetic diversity.
Identify that the pairing of homologous chromosomes and crossing over are key characteristics of prophase I, distinguishing it from other stages like metaphase I, anaphase I, and telophase I.