Crossing over:
Correct answer: B. Pachytene
- A. Plant cell
- B. Pachytene
- C. Anaphase I
- D. Somatic cells
Explanation
During the pachytene stage of prophase I in meiosis:1. Homologous chromosomes fully synapse, forming structures called tetrads or bivalents.2. Crossing over occurs, where genetic material is exchanged between non-sister chromatids of homologous chromosomes within the tetrad.3. This genetic recombination increases genetic diversity among the resulting gametes, promoting variation in offspring.
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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