Question

Biology Help! best answer 10 points!?

compare and contrast each of the following in mitosis and meiosis 1

#prophase and prophase 1

#metaphase and metaphase 1

#anaphase and anaphase 1

pleasee help , i dont understand these stages!

Answers

In prophase for both meiosis and mitosis, the DNA is condensed into visible chromosomes after duplication in preparation for cell division. In mitosis, there are two sets of chromosomes (called homologous pairs or tetrads since the same chromosomes pair together), whereas meiosis only has one set of chromosomes. Mitosis also has 'crossing over,' where genetic information is exchanged between the homologous pairs.

Metaphase is pretty much the same for both meiosis and mitosis. In metaphase, the chromosomes are lined up near the center of the cell by the cell's microtubules, which attach to the kinetochores of the chromosomes. The only difference I can think of is in mitosis there's only one set of chromosomes lined up where in meioses there are two sets of chromosomes lined up.

Anaphase is also pretty much the same - this is the stage where the chromosomes are separated and pulled/pushed towards the centromeres at opposite sides of the cell. In mitosis, each sister chromatide (each long half) of the chromosome is pulled apart to form two cells that are genetically identical to the parent cell. In meiosis, the homologous pairs are pulled apart so that the two resulting cells each still has a full set of chromosomes. These two cells will continue on to form four cells, each having half of the chromosome amount as the parent cell (the process of meiosis 2).

I hope this helps!

#1

omgee lol google it!

#2

The answers easy, 1+1=2! duh...

#3

Well for one, the first set occurs in mitosis, which is the division of sister chromatids. The second set occurs in the first part of meiosis, which is the division of homologous pairs into single chromosomes. If you want to know the details of each, open your textbook.

DRKANGEL- YOU HAVE MITOSIS AND MEIOSIS BACKWARDS. MEIOSIS HAS 2 PAIRS OF CHROMATIDS (THE TETRADS), AND THE "CROSSING OVER". YOU, SIR, ARE AN IDIOT.

#4

In MEIOSIS, there are two sets of chromosomes (called homologous pairs or tetrads since the same chromosomes pair together), whereas MITOSIS only has one set of chromosomes. MEIOSIS also has 'crossing over,' where genetic information is exchanged between the homologous pairs.

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#5

I did make a mistake in explaining prophase. I just swapped meiosis and mitosis. I'll repost Prophase in the next comment - the other explanations are correct. Sorry about the mixup =(

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#6