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- In the moss Polytrichum commune, the haploidchromosome number is 7. A haploid male gametefuses with a haploid female gamete to form a diploid cell that divides and develops into the multicellular sporophyte. Cells of the sporophyte thenundergo meiosis to produce haploid cells calledspores. What is the probability that an individualspore will contain a set of chromosomes all ofwhich came from the male gamete?Which of the following lettered structures is the female gametophyte?In homospory, the megaspore develops into female gametophyte True or False
- The leafy, green moss plants that are familiar are gametophytes, haploid plants. This is very different from flowering plants and other seed plants. Does a leafy green moss plant grow from a spore or from a fertilized egg? Does the moss plant have both paternal parent and maternal parent?Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the ascocarp undergoes karyogamy, meiosis, and mitosis to form eight ascospores. A diploid ascus that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A haploid zygote that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A dikaryotic ascus that forms in the ascocarp undergoes plasmogamy, meiosis, and mitosis to form eight ascospores.In plant life cycles, (a) the first products of meiosis are gametes (b) spores are part of the diploid sporophyte generation (c) the embryo gives rise to a zygote (d) the first stage in the diploid sporophyte generation is the zygote (e) the first stage in the haploid gametophyte generation is the prothallus
- Which of the following is TRUE for animal life cycle, but not for plant life cycle? O gametes are formed by mitosis O gametes are formed by meiosis O unicellular gametes O multicellular gametophytes O spores are formed by meiosis « PrevjousWhat is meant by monosporic development of female gametophyte?How are gametes formedin the pteridophyte life cycle,by mitosis or meiosis? What isthe type of meiosis that occursin pteridophytes?
- or lds P e t CO ea pre SC ctu of it h lu fru 0 2 > Regular 3 WW Where does meiosis take place in mosses? How do moss leaves differ from the leaves of vascular plants? Where, in mosses, are zygotes and embryos formed? What parts of a fern are diploid? Where, specifically, are fern antheridia located? 4 www 11 In Marchantia, what is the function of archegoniophores and antheridiophores? I In ferns, where does the switch from diploid to haploid occur? 5 a 6Draw a of alternation of generation of Mnium, a Genus of Mosses. Label all structures. Include both haploid and diploid structures. Draw the structures before fertilization and after fertilization. Indicate when fertilization occurs and how. Be sure to show the cycle from one generation to the next.Arrange the following in correct developmental sequence : Male gamete, Potential pollen mother cell, sporogenous tissue, Pollen grains, Microspore tetrad.