Which of the following images depicts alternation of generations?

Question

BlackTom AI · Accepted Answer

The task asks us to identify which image shows alternation of generations, a life cycle featuring two distinct multicellular stages: a diploid sporophyte (2n) and a haploid gametophyte (n) that alternate through meiosis and fertilization.

Option A: In this diagram, the cycle emphasizes a single pathway involving zygote formation and mitosis, with labeled meiosis and fertilization occurring in a way that does not clearly depict two separate multicellular generations alternating. It highlights a more linear view rather than distinct alternation between sporophyte and gametophyte phases.

Option B: This image clearly shows two interconnected generations: a sporophyte (2n) producing spores via meiosis, which then develop into a gametophyte (n). The gametophyte produces gametes that fuse by fertilization to form a zygote (2n), transitioning back to the sporophyte. This setup matches the classic alternation of generations pattern, with distinct multicellular haploid and diploid stages.

Option C: The diagram presents a loop that cycles through mitosis and fertilization in a single form, without clearly separating or highlighting two distinct multicellular generations. It does not clearly illustrate the alternation between a separate haploid gametophyte and diploid sporophyte.

In summary, option B best represents alternation of generations by depicting the alternating, multicellular haploid and diploid generations connected through meiosis and fertilization, whereas A and C do not provide that clear two-generation alternation.

BIO 181 (001&002) FALL 2025 (Additional Attempt Added) 3C - Self-Check: Classifying Biodiversity (LO 3C.1, 3C.2, 3C.3)

Which of the following images depicts alternation of generations?

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