Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 24, Problem 1VCQ

Figure 24.14 Which of the following statements is true?

  1. 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.
  • Chapter 24, Problem 1VCQ, Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the

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    Summary Introduction

    Introduction:

    Among fungi, Asus is found as the sac-like structure, which contains the haploid structures known as ascospores. These filamentous ascomycetes from the hyphae, which are divided by the septa. These hyphae allow streaming of cytoplasmic matrix from one cell to another.

    Answer to Problem 1VCQ

    Correct answer:

    The correct answer is an option (a).

    Explanation of Solution

    Explanation for the correct answer:

    Option (a)- Dikaryotic hyphae are produced, in which two haploid nuclei. These dikaryotichyphae can be homo or heterokaryotic. In each cell, two haploid nuclei fuse in the process of karyogamy and result in the diploid nucleus, then undergo meiosis and led to the ascospore formation. After the formation, the ascospores germinate and form hyphae.

    Explanation for incorrect answer:

    Option (b)- A diploid ascus does not undergo karyogamy, meiosis,and mitosis to form the eight ascospores because only dikaryotic undergo karyogamy. Hence, this option is incorrect.

    Option (c)- In the same way, a haploid zygote does not undergo the karyogamy, meiosis,andmitosis. Hence, this option is incorrect.

    Option (d)- A dikaryotic ascus only formed by the process of karyogamy not by the plasmogamy meiosis and mitosis to form eight ascospores. Hence, this option is incorrect.

    Conclusion

    Dikaryotic hyphae are produced in which two haploid nuclei with the help of karyogamy, not by the plasmogamy. Hence, the correct answer is option (a).

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    After plasmogamy has occurred, many molds (Mucoromycetes) exist in a heterokaryotic stage for up to centuries at a time. What occurs at the immediate end of this stage? The nuclei fuse in a process called karyogamy. The hyphae fuse in a process called karyogamy. Diploid spores are produced in various spore-producing structures. A haploid zygote is formed that becomes multicellular through repeated rounds of mitosis.
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