Directions: The goal of this assignment is to understand the role of meiosis, re

Question

Directions: The goal of this assignment is to understand the role of meiosis, recombination, and mitosis in the life cycle and genetic diversity of the model organism Sordaria fimicola. See the lab syllabus for the due de 1. On the diagram below, indicate (with the appropriate letter) where plasmogamy (A), the dikaryon (B). karyogamy (C), meiosis (D), and mitosis (E) are occurring. 2. For the purposes of this assignment, assume that the + mating type individual (red) produces wild-type rams of the ascus types drawn in lab, create a diagram illustrating the stages of meiosis (including recombination between the wild-type and tan allele) followed by mitosis at the locations they occur in the sexual life cycle to produce the three different ascus types (you do not need to diagram any aspect of asexual reproduction). .Be sure to link your drawings of meiosis for the different ascus types to the life cycle drawing should be no 3. How does the process of meiosis contribute to the genetic variation of Sordaria? Your answer more than 4 sentences. Your answer should be no 4. How might increasing the frequency of recombination affect genetic variation? more than 4 sentences. Spores Ascogonium Sexual Reproduction Antheridium + mating type - mating type Mycelia Note: This diagram shows a fungal cross with no recombination

Explanation / Answer

A- plasmogamy occurs where fusion of ascogonium and antheridium fuse.

B- dikaryon is a fungal cell with two genetically distinct but compatible nuclei.

C- Karyogamy- It is the fusion of two nuclei in the asci to form zygote

D- Meiosis- Meiosis results in the formation of four haploid nuclei in ascus

E- Mitosis- After fusion of antheridium and ascogonium, there is mitosis, resulting in many dikaryotic hyphae.

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