11.3

Question 1

Describe the 4 distinct features of meiosis

Answer 1

 Homologous pairing & crossing over
 Sister chromatids remain joined @ their centromeres & segregate together during anaphase I
 Kinetochores of sister chromatids attach to the same pole in meiosis I
 DNA replication is suppressed between meiosis I & II

Question 2

Illustrate the difference between chromosome behavior in mitosis

Answer 2

 Homologues do NOT pair
 microtubules attach to kinetochores on each sister chromatid
 microtubules pull sister chromatids apart

Question 3

Illustrate the difference between chromosome behavior in meiosis I

Answer 3

 Crossovers & sister chromatid cohesion lock homologues together
 Microtubules connect to the kinetochores of an entire homolog so that homologues are pulled toward opposite poles
 Microtubules pull the homologous chromosomes apart, but sister chromatids are held together at the centromere

Question 4

Describe the differences in chromatid cohesion in meiosis and mitosis.

Answer 4

 Meiosis-specific cohesion proteins
 Maintenance of sister chromatid cohesion @ centromere during all of meiosis I

Question 5

Explain the importance of the suppression of replication between meiotic divisions.

Answer 5

o gametes would be diploid, and zygotes would be tetraploid
o Cyclin B is important in suppressing replication

Question 6

Explain how the cells resulting from meiosis are not identical.

Answer 6

Not identical cells are due to random orientation of chromosomes @ meiosis I & because of crossing over