Warm Up 7 is due Wednesday March 3, 2004, at 9:30 am
Remember...look at the lecture notes and do the readings before (or while) doing the Warm Up. You may need to look terms up in the book's glossary or on the CD (or on google!).

First name :

Last name :

Class Section (1, 2 or 3):
(See Oncourse to determine whether you are in 1= A410, 2 = A411, or 3 = A413)

Please enter a nickname (in case your answer is used in class!)

The following three questions refer to material you were to read in preparation for class. These questions require you to write a three or four sentence response. It is OK to answer 'I don't know' - but STATE WHY you are confused! (Don't just say 'I don't know' - you probably DO!) Each WarmUp worth 3 points if answered on time and must be submitted via the web. See notes page for prior Warm Ups and student responses.

QUESTION 1: Which gender is doing more meiosis RIGHT NOW in class - the males or the females? Or do men and women undergo meiosis at pretty much equal rates? What type of cell is the end product of meiosis in men? What type of cell is the end product of meiosis in women? How many chromosomes do these cells have compared to our other body cells?

QUESTION 2: A common error in meiosis in an egg (or a sperm) can result in trisomy ('three-chromosomes'), in which each somatic cell of the of baby has 3 copies of one particular chromosome. Trisomy 21 is when an individual has not 2 but 3 copies of Chromosome 21 in every one of their cells. Trisomy 21 is also called Down Syndrome. What do you think happens in meiosis that would result in 3 copies of Chromosome 21 in an embryo? Do you think there are other trisomys in humans?

QUESTION 3: During development of the human embryo (or any vertebrate embryo), a process called gastrulation occurs. Read the notes for details. Louis Wolpert, a famous embryologist, once made this remark: "The most important event in your life is not birth, marriage, or death, but gastrulation." From an embryological standpoint, why IS gastrulation one of the most important events in your life? :)

QUESTION 4: Optional: Questions or comments about Mitosis, Meiosis, or Embryonic Development?

You can change your mind as many times as you like before hitting Submit. Print this page before submitting if you want to keep a record of your answers. You will get a confirmation box to let you know that your answers were submitted, and will return to the N100 main page after submitting.