Multiple Choice
Synapsis (pairing of homologous chromosomes via the synaptonemal complex) occurs during which stage of meiosis?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
Before meiosis can begin, what key event must occur to ensure each gamete can receive a complete set of genetic information?
A
Cytokinesis to split the cytoplasm and form haploid daughter cells before nuclear division
B
Separation of sister chromatids during anaphase II to reduce the chromosome number
C
Crossing over between sister chromatids to create new allele combinations
D
DNA replication during S phase to produce sister chromatids for each chromosome
Verified step by step guidance1
Understand that meiosis is a specialized type of cell division that reduces the chromosome number by half to produce haploid gametes from a diploid parent cell.
Recognize that before meiosis begins, the cell must ensure that each chromosome is duplicated so that the resulting gametes receive a complete set of genetic information.
Recall that DNA replication occurs during the S phase of the cell cycle, producing sister chromatids for each chromosome, which are essential for proper segregation during meiosis.
Note that without DNA replication, chromosomes would not have sister chromatids, and gametes could end up with incomplete or missing genetic information.
Therefore, the key event before meiosis is DNA replication during the S phase, which prepares chromosomes for the subsequent steps of meiosis.
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