The number of taxa exhibiting asexual reproduction is drastically reduced in the higher plants (angiosperms) and higher animals (vertebrates) as compared with lower groups of plants and animals. Analyse the possible reasons for this situation.
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- Which two structures evolved though a series of changes in the reproductive biology among some heterosporous plants during the late Devonian period allowed spermatophytes (seed plants) to reduce or eliminate their dependence on water for gamete fertilization and development of the embryo and allowed them to colonize a much wider range of habitats?In same species of Asteraceae and grasses, seed are formed without fusion of gametes. Mention the scientific term for such form of reproduction.When the Ascomycetes fungus reproduces sexually, mating type A fungi cross fertilize mating type a fungi. The resulting zygotes undergo meiotic and then mitotic division to produce asci with eight ascospores. The ascospores in the asci are ordered and reflect the position of the parental nuclei in the zygote. Use the passage to answer the question. How is the life cycle of Ascomycetes different from that of humans? A. Haploid cells undergo meiosis. B. Haploid cells undergo mitosis. C. Diploid cells undergo meiosis. D. Diploid cells undergo mitosis.
- Complete the following analogies: a. Gametophyte is to haploid as __________ is to diploid. b. __________ are to conifers as flowers are to __________. c. Ovule is to seed as ovary is to __________.When the Ascomycetes fungus reproduces sexually, mating type A fungi cross fertilize mating type a fungi. The resulting zygotes undergo meiotic and then mitotic division to produce asci with eight ascospores. The ascospores in the asci are ordered and reflect the position of the parental nuclei in the zygote. Use the passage to answer the question. Based on the diagram, how many unique ascospores are produced in each ascus resulting from the cross fertilization of two Ascomycetes fungi? A. 1 B. 2 C. 4 D. 8Define the following asexual reproduction of plants. 1. Budding 2. Fragmentation 3. Vegetation Propagation 4. Spore Formation Define the following asexual reproduction done by animals. 1. Binary Fussion 2. Budding 3. Fragmentation and Regeneration 4. Parthenogenesis
- Explain the difference between n and 2n as they relate to plant life cycles. Explain the difference between x and 2x as they relate to ploidyWhich of the following IS found in basal land plants (Embryophyta), but NOT found in Chara?a. Multicellular gametangia with sterile jacket.b. Diploid mitosis.c. Photoautotrophous gametophyted. Haploid mitosis.e. Sperm cells with two flagellaBoth antheridia and archegonia are on the same gametophyte. Is the gameto-phyte dioecious or monoecious?
- For those who aren't scientists, there is disappointment when it's learned that scientists don't have all the answers to our questions. (Personally, it took awhile for me to be comfortable with this, and now I love it!). After reading the links and article, what are at least five unanswered questions that pertain to angiosperm evolution and diversification.There are two alternative hypotheses about the life cycle of the early vascular plants, the transformation hypothesis and the interpolation hypothesis. If Rhynia and Sciadophyton are the two generations of one species, which hypothesis would be favored? Briefly describe the other hypothesis.When the Ascomycetes fungus reproduces sexually, mating type A fungi cross fertilize mating type a fungi. The resulting zygotes undergo meiotic and then mitotic division to produce asci with eight ascospores. The ascospores in the asci are ordered and reflect the position of the parental nuclei in the zygote. Use the passage to answer the question. Although ascospores are produced by mitotic division, none of the spores develop into fungi that are identical to either parental hyphae. What is the BEST explanation for this observation? A. The spores inherit half their genes from each parent. B. The spores inherit haploid nuclei from their parents. C. The spores inherit mutations as a result of meiosis. D. The spores inherit mutations as a result of mitosis.