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Thus ____ types of chromatids will be produced after one crossing over.

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Final answer:

Crossover during meiosis leads to an exchange of genetic material and the creation of new combinations of genes. After one crossing over event, four types of chromatids are produced.

Step-by-step explanation:

Crossover during meiosis leads to an exchange of genetic material between non-sister chromatids of homologous chromosomes. This process, known as recombination, creates new combinations of genes and increases genetic variation. When one crossover occurs, two recombinant chromatids and two non-recombinant chromatids are produced. So, after one crossing over event, four types of chromatids are produced.

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