cell division

Question 1

mitosis

Answer 1

unicellular and multicellular
2 identical copies of parents
nucleus divides one time
body cells

Question 2

meiosis

Answer 2

multicellular only
4 cells with half chromosome number
nucleus divides twice
germ cells

Question 3

chromosome

Answer 3

highly condensed DNA structure

Question 4

replicated structure

Answer 4

sister chromatids joined at the centromere

Question 5

cell cycle

Answer 5

1- interphase
2- mitosis
3-cytokinesis

Question 6

interphase

Answer 6

90% of cell cycle

Question 7

mitosis steps

Answer 7

1- prophase
2-metaphase
3-anaphase
4-telophase

Question 8

prophase

Answer 8

chromosomes begin to condense and become visible
nucleoli disappear
centrioles migrate to different poles
spindle fibers form
nuclear membrane disintegrate

Question 9

metaphase

Answer 9

chromosomes line up
centrosomes are at opposite poles

Question 10

anaphase

Answer 10

centromeres of each chromosome separate
spindle fiber pulls sister chromatids away

Question 11

telophase

Answer 11

chromosomes set cell pole
nuclear membrane reforms

Question 12

cytokinesis

Answer 12

Animal cells: a cleavage furrow forms down the middle and separates the cells
Plant cells: llamelia cell plate forms in the middle
cells don’t separate

Question 13

meiosis steps

Answer 13

reduction: reduces number of chromosomes to half
1- interphase 1
2-metaphase1
3-anaphase1
4- telophase 1
and the same process again

Question 14

interphase

Answer 14

preparation phase

Question 15

prophase1

Answer 15

synapse and crossing over

Question 16

synapse

Answer 16

homologous pairs, pair up so crossing over happens

Question 17

crossing over

Answer 17

exchange genetic material

Question 18

metaphase1

Answer 18

Tetrads line up at the cell equator

Question 19

anaphase 1

Answer 19

Chromosome pairs separate and move to opposite poles

Question 20

telophase 1

Answer 20

cell divided into two

Question 21

what’s the difference between anaphase1 and anaphase 2

Answer 21

anaphase1: separates two homologous chromosomes
anaphase 2: separates sister chromatids