Meiosis and Crossing Over in Sordaria
Based on your knowledge about human chromosomal disorders and nondisjunction due to loss of control during the cell cycle, identify the name of the syndromes and karyotypes of the following patients.
Analysis:
- Once you have determined if crossing over has occurred in at least 50 hybrid asci, record your data in the table below.
- Based on your counts, determine the percentage of asci showing crossover. Record in the table below.
- Divide the percent showing crossover by 2. This is your gene to centromere distance. (The percentage of crossover asci is divided by 2 because only half of the spores in each ascus are the result of a crossover event.)
Conclusion:
We concluded that we can determine that 50% of our Asci was our total from crossing.A majority of our Asci contained the four dark and four light combination. It was a little difficult to tell the cross over in the cells due to miscalculations in countings but we figured it out and divided the work in half.We concluded that the ones with no sign of four dark and four light combinations were not parental and showed crossing over.I learned more about how crossing over can be visual in photos of cells or even under a microscope.
We concluded that we can determine that 50% of our Asci was our total from crossing.A majority of our Asci contained the four dark and four light combination. It was a little difficult to tell the cross over in the cells due to miscalculations in countings but we figured it out and divided the work in half.We concluded that the ones with no sign of four dark and four light combinations were not parental and showed crossing over.I learned more about how crossing over can be visual in photos of cells or even under a microscope.