Today we needed to practice our understanding of meiosis and mitosis. So...... Mr.C gave us the task of creating a demo showing both of the processes using props like candy, marshmallows and toothpicks. The organism we modeled had a diploid number of 4. We were to represent the nucleus at all stages, indicate the key activities in each stage and products of each division. We took the class to prepare and present, so we ended up with homework. We were to finish the questions on the back of our assignment sheet, complete the chart handout and read abnormal meiosis on page 454-456 and amniocentesis on page 458.
Thoughts:
During oogenesis I know that four "daughter cells" are produced from the primary oocyte, the first meiotic division produces two cells each with 23 chromosomes, so why does it still undergo another division when only the mature oocyte survives and the other three die as polar bodies anyway? In spermatogenesis it makes sense because all four cells survive so there are larger amounts of sperm. Maybe in oogenesis the mature oocyte needs the nutrients provided by the polar bodies.
Additional:
I wanted to see what meiosis and mitosis looked like in a real cell, I've seen enough cartoons! Also some products of meiosis and mitosis.
Meiosis:
Mitosis
1 comment:
good post Ceanna,
3/3
Mr.C
Post a Comment