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Ch. 29 - Fungi
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All textbooksFreeman 8th EditionCh. 29 - FungiProblem 10

Chapter 28, Problem 10

When a fruit fly embryo first begins to develop, a large cell is generated that contains over 8000 genetically identical nuclei. What is most likely responsible for this result?

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Hello everyone. And in today's video we have the following problem. So you observed that a large cell contains 50 genetically identical nuclear. Which of the following. That you believe is not occurring In the cell during M. Phase. So remember that if a cell contains 50 genetically identical nuclear, it is undergoing my toast is however it is undergoing my toeses uncontrollably. Usually when a cell undergoes mitosis it creates two identical cells. However the cells continue dividing, Creating nuclear until 50 in total were rich. Well there is a process that comes after mitosis happens right about here called psychokinesis. And this process prevents this that we see here, psychokinesis divides the cell into two identical cells. It cleaves the cell. So when Michael says happens it creates two identical nuclear and then psychokinesis comes and it divides these two identical nuclear into two daughter cells. This is how the two daughter cells are created. However, in this cell it appears that psychokinesis is not occurring and the cell just kept dividing and dividing and creating more nuclei as it underwent more rounds of mitosis. So this is going to be the final answer to our question. The fact that psychokinesis is not occurring in the cell is going to be the end of the video. I really hope it helped you. And I hope to see you on the next one
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A particular cell type spends 4 hours in G1 phase, 2 hours in S phase, 2 hours in G2 phase, and 30 minutes in M phase. If a pulse–chase experiment were performed with radioactive thymidine on an asynchronous culture of such cells, what percentage of mitotic cells would be radiolabeled 9 hours after the pulse? a. 0 percent b. 50 percent c. 75 percent d. 100 percent

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Table 29.1 mentions that chytrids are responsible for massive die-offs currently occurring in amphibians. Review Koch's postulates; then design a study showing how you would use Koch's postulates to test the hypothesis that chytrid infections are responsible for frog deaths.

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Some fungi have elaborate mechanisms for dispersing spores. For example, the 'squirt gun' fungus Pilobolus, which grows in cow dung, forcibly shoots off tiny black sporangia filled with spores. Any sporangia that are flung onto fresh grass are likely to be eaten by a grazing cow, passed through its digestive system unharmed, and deposited in a new batch of dung. The spores carried within the sporangia are perfectly positioned to grow into a new mycelium. Pilobolus is a zygomycete, and the sporangia just described produce asexual spores. In contrast, which of the following best describes what happens during the sexual phase of its life cycle? a. It produces eight ascospores in each ascus. b. It produces basidiospores that grow into mushrooms. c. It produces motile sperm and eggs. d. Hyphae from two compatible mating types fuse and form a zygosporangium.

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Textbook Question

Both asexual sporangia (shown in the photo) and zygosporangia can be found in cow dung. Make a simplified drawing that illustrates the events of plasmogamy, karyogamy, and meiosis that occur during sexual reproduction in Pilobolus. Be sure to indicate and label the zygosporangium.

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