Homework SourseAt which point on the phylogenetic tree shown above did each
At which point on the phylogenetic tree shown above did each of the following evolve? The numbers above may be used once, more than once, or not at all.
| 1. | The alternation of generations in ferns differs from that in conifers in which of the following ways? | |||||||||||||
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Solution
Answer:
1). ferns are heterosporous and conifers are homosporous
2). spores; gametes; zygote
Sporophyte produces spores. The spore generates gametophyte. The gametophye produces gametes and they unite to form zygote.
3). Chara
Haplontic life cycle: In the whole cycle, zygotes are the only diploid cell; mitosis occurs only in the haploid phase. The individuals or cells as a result of mitosis are haplonts, hence this life cycle is also called haplontic life cycle.
4).
5). produced by meiosis in both anthers and carpels.
Anther produces spores that develop into the male gametophytes. Carpel produces spore that develops into a female gametophyte which produces and egg.
6). a leaflike organ bearing sporangia
