1. Inquiry into Meiosis Lab
Thursday, April 23rd:
Inquiry into Meiosis Lab
Examining Crossing-over using Sordaria
Today, I will…
Describe the process of meiosis.
Explain how crossing over effects asci expression in Sordaria.

2. Sordaria fimicola, a fungus
Two strains of Sordaria (wild type/tan mutant) inoculated on a plate of agar. Where the mycelia of the two strains meet, fruiting bodies called perithecia develop. Meiosis occurs within the perithecia during the formation of asci, or a sac that contains haploid ascospores (gametes).
perithicia
Sordaria fimicola, a fungus

3. You will take a prepared slide of Sordaria and using
the 10x objective, observe a group of hybrid asci,
containing both tan and black ascospores.
Count at least 50 hybrid asci and enter your data in Table 3.3.

4. Feel free to reference PH Lab Bench as well.
There will be an essay that you will
complete on FRIDAY over this lab,
in lieu of a lab report.
Review crossing over and
be able to explain gene linkage.
Gene map (1% = 1 Map unit)