These three types of cycles feature alternating haploid (n) and diploid (2n) phases.
The haploid organism becomes diploid through fertilization, with joining of gametes. This results in a diploid zygote. To return to a haploid stage, meiosis must occur.
The cycles differ in the product of meiosis, and whether mitosis (growth) occurs. Zygotic and gametic meiosis have one mitotic stage and form during the n phase in zygotic meiosis and during the 2n phase in gametic meiosis. Therefore, zygotic and gametic meiosis are collectively term haplobiontic (single meiosis per phase). Sporic meiosis, on the other hand, has two meiosis events (diplobiontic): one in each phase.
These three types of cycles feature alternating haploid (n) and diploid (2n) phases.The haploid organism becomes diploid through fertilization, with joining of gametes. This results in a diploid zygote. To return to a haploid stage, meiosis must occur.The cycles differ in the product of meiosis, and whether mitosis (growth) occurs. Zygotic and gametic meiosis have one mitotic stage and form during the n phase in zygotic meiosis and during the 2n phase in gametic meiosis. Therefore, zygotic and gametic meiosis are collectively term haplobiontic (single meiosis per phase). Sporic meiosis, on the other hand, has two meiosis events (diplobiontic): one in each phase.
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