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AP LAB #3 part C Crossing Over during Meiosis in Sordaria… counting map units.

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Presentation on theme: "AP LAB #3 part C Crossing Over during Meiosis in Sordaria… counting map units."— Presentation transcript:

1 AP LAB #3 part C Crossing Over during Meiosis in Sordaria… counting map units

2 Sordaria fimicola is a type of FUNGUS, found in the group known as ASCOMYCOTA “Sac fungi”

3 ascusascus The shared derived character that defines the Ascomycota is the ascus. It is within the ascus that nuclear fusion and meiosis take place. Ascus are found in here… in the ascocarp!

4 Sordaria fimicola~ ASCOMYCOTA See, here they are… ASCI!

5 This is what it looks under a scanning e- microscope!

6 Here they are… ASCI! ~ they hold ASCOSPORE

7 Here they are… ASCI! ~ there are chromosomes inside those dots!!

8 In the ascus, meiosis occurs, followed by a round of mitosis. This leaves eight nuclei, and eventually eight ascospores THERE ARE CHROMOSOMES INSIDE THOSE SPORES… AND WITHIN THE CHROMATIN, THERE ARE GENES…. These genes code for traits… COLOR

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10 Ascospores are formed within the ascus by an enveloping membrane system, which packages each nucleus with its adjacent cytoplasm and provides the site for ascospore wall formation

11 Sordaria fimicola~ ASCOMYCOTA

12 S phase Meiosis I Meiosis II

13 Sordaria fimicola~ ASCOMYCOTA

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17 How many DID NOT crossover? No X-over

18 Sordaria fimicola~ ASCOMYCOTA How many DID crossover? Did X-over

19 Sordaria fimicola~ ASCOMYCOTA How many DID crossover? Total counted X 100

20 Sordaria fimicola~ ASCOMYCOTA X 100

21 Sordaria fimicola~ ASCOMYCOTA. 573 X 100 = 57.3

22 Sordaria fimicola~ ASCOMYCOTA How many DID crossover? Total counted X 100 Divide this number by 2

23 Sordaria fimicola~ ASCOMYCOTA. 573 X 100 = / 2

24 Sordaria fimicola~ ASCOMYCOTA = 28.65

25 Sordaria fimicola~ ASCOMYCOTA = this means MAP UNITS

26 Sordaria is a haploid organism for the majority of its life cycle It becomes diploid only when mycelia fuse and two different types of haploid nuclei form a diploid nucleus.

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