Question

The process by which the number of chromosomes in a diploid cell is reduced by half is called A. mitosis. B. meiosis. C. telophase. D. cross-pollination.

Answer 1

@coopera7 Can we get rid of a few options? I'll help walk you through.

Answer 2

D is wrong, thats all i can think of

Answer 3

@coopera7 Yes. C is telophase, which is a part of mitosis and meiosis. So, is C excluded or not?

Answer 4

C is the answer i think..

Answer 5

@coopera7 If telophase is part of both meiosis and mitosis, wouldn't we need a option for more than one answer?

Answer 6

true.

Answer 7

@coopera7 So, do you know what occurs in mitosis and meiosis? In a very general way, like what is the start and finish of the process.

Answer 8

mitosis you start with one cell and end with 2 daughter cells. i don't know about meiosis.

Answer 9

@coopera7 So, meiosis is basically two rounds of mitosis. However, there is a key issue here. DNA is duplicated in the S phase, mitosis and meiosis both occur in the M phase of a cell life cycle. In cells undergoing mitosis only this would be the pattern: we start in interphase at G1 (simple growth), S phase (DNA duplication), G2 (prep for M phase), exit interphase and start M phase, finish M phase, back to interphase and G1.

Now, with meiosis the cell repeats M phase before going back to interphase. Why does this matter? Remember, DNA is duplicated in an interphase step.

That should help.

Answer 10

Mitosis is correct?

Answer 11

@coopera7 I'll give you the answer, but first I am going to explain it. We will use humans. We have 46 chromosomes, but each chromosome has a "sister" or "pair". So, we have 23 pairs. For each pair, one chromosome comes from our mother and the other from our father.

If we follow a human cell in mitosis we see:

interphase G1: 23 pairs.
interphase S: 46 pairs, 92 chromsomes (DNA is duplicated)
interphase G2: same as S:
M-phase mitosis: start; 1 cell, 46 pairs, 92 chromosomes
M-phase mitosis end; 2 cells, each cell has 23 pairs and 46 chromsomes
interphase G1: 23 pairs for both cells from M-phase mitosis end.

For human meiosis (sperm and egg)
interphase G1: 23 pairs.
interphase S: 46 pairs, 92 chromsomes (DNA is duplicated)
interphase G2: same as S:
M-phase meiosis: start; 1 cell, 46 pairs, 92 chromosomes
M-phase meiosis I end: 2 cells, each 23 pairs and 46 chromosomes
M-phase meiosis II start: 2 cells, each 23 pairs and 46 chromsomes
M-phase meiosis II end: 4 cells, each 23 chromosomes
interphase: G1

So, the answer is meiosis. It goes from 2n (diploid) to n (haploid).

Answer 12

meiosis