ap lab #3 part c crossing over during meiosis in sordaria… counting map units
DESCRIPTION
AP LAB #3 part C Crossing Over during Meiosis in Sordaria… counting map units. Sordaria fimicola is a type of FUNGUS, found in the group known as ASCOMYCOTA. “Sac fungi”. - PowerPoint PPT PresentationTRANSCRIPT
AP LAB #3
part C
Crossing Over during Meiosis in Sordaria… counting map units
Sordaria fimicola is a type of FUNGUS, found in the group known
as ASCOMYCOTA
“Sac fungi
”
The shared derived character that defines the Ascomycota is the
ascusascus. It is within the ascusascus that nuclear fusion and meiosis take
place.
Ascus are found in here… in the ascocarp!
Sordaria fimicola~ ASCOMYCOTA
See, here they are… ASCI!
Sordaria fimicola~ ASCOMYCOTA
This is what it looks under a scanning e- microscope!
Sordaria fimicola~ ASCOMYCOTA
Here they are… ASCI! ~ they hold ASCOSPORE
Sordaria fimicola~ ASCOMYCOTA
Here they are… ASCI! ~ there are chromosomes inside those dots!!
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
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
Sordaria fimicola~ ASCOMYCOTA
Sordaria fimicola~ ASCOMYCOTA
S phase Meiosis I Meiosis II
Sordaria fimicola~ ASCOMYCOTA
Sordaria fimicola~ ASCOMYCOTA
Sordaria fimicola~ ASCOMYCOTA
Sordaria fimicola~ ASCOMYCOTA
Sordaria fimicola~ ASCOMYCOTA
How many DID NOT crossover?
No X-over
Sordaria fimicola~ ASCOMYCOTA
How many DID crossover?
Did X-over
Sordaria fimicola~ ASCOMYCOTA
How many DID crossover?
Total countedX 100
Sordaria fimicola~ ASCOMYCOTA
349
609X 100
Sordaria fimicola~ ASCOMYCOTA
. 573 X 100 = 57.3
Sordaria fimicola~ ASCOMYCOTA
How many DID crossover?
Total countedX 100
Divide this number by 2
Sordaria fimicola~ ASCOMYCOTA
. 573 X 100 = 57. 3 / 2
Sordaria fimicola~ ASCOMYCOTA
= 28 .65
Sordaria fimicola~ ASCOMYCOTA
= 28 .65 this means 28.65 MAP UNITS
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.
