Meiosis is a process in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes
in a diploid cell. Meiosis usually involves two distinct divisions called meiosis I and meiosis II. By the end of meiosis, a single diploid cell has produced four haploid cells.
After interphase I, the cell begins to divide, and the chromosomes pair up. In prophase 1 of meiosis, each replicated chromosome pairs with its corresponding homologous chromosome. This pairing forms a structure called a tetrad, which contains four chromatids. As the chromosomes pair, they sometimes undergo a process called crossing-over.
Which is a true statement of crossing-over?
A. Homologous chromosomes move to opposite ends of dividing cells
B. During crossing-over, bits and pieces of the homologous chromosomes are exchanged
C. The DNA of the diploid cell is copied
D. Crossing over decreases genetic diversity
After interphase I, the cell begins to divide, and the chromosomes pair up. In prophase 1 of meiosis, each replicated chromosome pairs with its corresponding homologous chromosome. This pairing forms a structure called a tetrad, which contains four chromatids. As the chromosomes pair, they sometimes undergo a process called crossing-over.
Which is a true statement of crossing-over?
A. Homologous chromosomes move to opposite ends of dividing cells
B. During crossing-over, bits and pieces of the homologous chromosomes are exchanged
C. The DNA of the diploid cell is copied
D. Crossing over decreases genetic diversity
1 answer:
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