I need reassurance and confirmation of my answers please. Biology?

Question

http://img293.imageshack.us/img293/7463/helpja7.jpg

Referring to that image, can you help confirm my answers?


1. Which diagram represents a cell preparing to enter anaphase?
I think it's A.

2. Which diagram represents a cell ready to enter G1?
I think it's B.

3. Which diagram represents the cell that just left G2?
I think it's C.

I'm not too sure about the next question.
4. Which diagrams represent(s) a cell with the 2(n) number of chromosomes?
A) A
B) B
C) C
D) A and B
E) A and C

5. The sequence for mitosis is ..
A) A, B, C
B) B, C, A
C) C, A, B
D) A, C, B

I think it's C.


Thanks :) I just need reassurance because I just learned this topic and I'm a bit confused.

Answer 1

1. This is definitely A, nice job.

2. G1 phase has (n) number of chromosomes and is a preparatory stage. This leads me to believe the answer is B. These cells are performing cytokenesis and will surely enter the non-mitotic cycle. So... good job =).

3. This would surely be C - G2 phase means it has passed the (s) phase or DNA replication, meaning it has double the number of chromosomes or 2(n). This then leads us to the next question.

4. This one is a bit ambiguous - it's tricky. We know C must be in the answer because it has just left the G2 phase. That means we can cross out A, B, and anything related. That leaves us with either answer C or E. Now, the question we must ask ourselves is whether A is actually 2(n). I would assume the answer is E. Until cytokenesis - the last stage of the cell cycle -the the mitotic cell is considered one cell, not two daughter cells. I suggest going with E. It's open for interpretation really.

And number 5: Yep, nice job - it's C. However, this is meiosis, not mitosis.

Answer 2

1, 2, 3 are fine.
4. E
5. None of these pictures show mitosis. They show meiosis because the homologous chromosomes synapse, go to the equator of the spindle as a synapsed pair, and the chromosomes in the divided cell are still double-stranded. If you wonder about the sequence for meiosis, it's answer C.