Question

Найбільш особлива фаза мейозу

Answer 1

Ответ:

Профаза І — найтриваліша за часом у мейозі. Під час цієї фази хромосоми починають ущільнюватися і набувають вигляду паличкоподібних структур (спіралізуються). Після цього гомологічні хромосоми (хромосоми однієї пари) зближуються й кон'югують (тісно прилягають одна до одної по всій довжині, обвиваються, перехрещуються).

Объяснение:

Answer 2

найбільш особливою є перед остання фаза: анафаза

Answer 3

The Most Unique Phase of Meiosis

The most unique phase of meiosis is the prophase I. During prophase I, several important events occur that distinguish it from other phases of meiosis.

1. Leptotene: In the first stage of prophase I, called leptotene, the chromosomes condense and become visible under a microscope. Each chromosome consists of two sister chromatids held together by a centromere.

2. Zygotene: In the next stage, called zygotene, homologous chromosomes pair up and align with each other. This process is known as synapsis. The paired chromosomes are called bivalents or tetrads.

3. Pachytene: During pachytene, the chromosomes continue to condense, and crossing over occurs. Crossing over is the exchange of genetic material between homologous chromosomes. This process increases genetic diversity by shuffling genetic information between chromosomes.

4. Diplotene: In diplotene, the chromosomes start to separate, but the homologous chromosomes remain connected at points called chiasmata. The chiasmata are the sites where crossing over occurred during pachytene.

5. Diakinesis: In the final stage of prophase I, called diakinesis, the chromosomes further condense, and the nuclear envelope breaks down. The spindle fibers start to form, preparing for the next phase of meiosis.

Prophase I is unique because it involves the pairing of homologous chromosomes, crossing over, and the formation of chiasmata. These events contribute to genetic diversity and ensure the proper segregation of chromosomes during meiosis.

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