객관식
Crossing over (genetic recombination) occurs during which phase of meiosis?
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9. Mitosis and Meiosis
Meiosis
객관식
In sexually reproducing organisms, what is the overall purpose of meiosis?
A
To produce haploid gametes by reducing the chromosome number and generating genetic variation for sexual reproduction.
B
To repair DNA damage by swapping nucleotides between homologous chromosomes without changing ploidy.
C
To produce two genetically identical diploid daughter cells for growth and tissue repair.
D
To replicate DNA without cell division so that chromosome number increases each generation.
검증된 단계별 안내1
Understand that meiosis is a specialized type of cell division occurring in sexually reproducing organisms.
Recognize that the main goal of meiosis is to reduce the chromosome number from diploid (2n) to haploid (n), which is essential for maintaining chromosome number across generations.
Note that meiosis produces gametes (sperm and egg cells) that carry half the genetic material of the parent cell.
Acknowledge that meiosis introduces genetic variation through processes like crossing over (exchange of genetic material between homologous chromosomes) and independent assortment of chromosomes.
Conclude that the overall purpose of meiosis is to generate haploid gametes with genetic diversity, enabling sexual reproduction and stable chromosome number in offspring.
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