Biology HW help? D:?

Question

Questions: WHy is it important for chromosomes to line of in the middle of cell during mitosis?

#2: IN a cell which is prepared for mitosis, why ar ethe 2 chromatids of each chromosome genetically identical?

#3: How many chromosomes does egg and sperm have to produce a normal zygote?

and... How many chromosomes would each sperm or egg have if human eggs and sperm were produced by mitosis?

Thanks so much guys :]

Answer 1

1.) They line up in the middle so each new cell that's being made gets a perfect copy.

2.) The new cells that are being made need to be the same and have the same genetic info.

3.) Each s*x cell need 22 chromosomes and 1 X or Y chromosome.

4.) Sperm and eggs would each have 22 chromosomes. For a cell to prepare for mitosis, it splits from 44 to 22. For a cell to do meiosis, it doubles its chromosome number from 44 to 88 then splits twice to 22 for each new cell (four are made this way compared to 2 mitosis made cells).

Answer 2

1.  They line in the middle so they split evenly, 50:50

2. There are 2 identical chromatids so the cell can reproduce an exact copy.

3. 22 chromosomes in humans

4.  The egg, not the sperm would have 44 chromosomes.