cell division

Question 1

interphase

Answer 1

.

Question 2

prophase I

Answer 2

homologous chromo pair up- bivalent 
crossing over (swapping alleles)

Question 3

Metaphase I

Answer 3

independent assortment of homologous chromosomes

h.chromo line along eq

Question 4

anaphase I

Answer 4

spindle fibres separate h.chromo at chiasma to opp poles

no sep of centromere

Question 5

telophase I

Answer 5

nuclear env reformes

2 haploid cells

Question 6

what is the chiasma

Answer 6

where non-sister chromatids cross over

Question 7

homologous chromo

Answer 7

pair of chromo w/same structure an genes one from mother and one from father

Question 8

mitosis

Answer 8

cell div, 2 gen id daughter cells

Question 9

role of mitosis

Answer 9

growth
tissue repair
asexual reproduction

Question 10

centromere

Answer 10

structure on chromo that link sister chromatids together

Question 11

what gets attched to spindle fibres during anaphase I

Answer 11

centromere

Question 12

meiosis

Answer 12

nuclear div that prod 4 haploid gametes which are gen non-id

Question 13

role of mitosis

Answer 13

sexual reproduction

Question 14

where does meiosis occur

Answer 14

reproductive organs only- ovaries, testes

Question 15

where does mitosis occur

Answer 15

body cells

Question 16

3 stages of interphase

Answer 16

G1- first growth pahes
S- synthesis pahse
G2- second growth phase

Question 17

G1-

Answer 17

protiens for organelle synthesis form, organelles replicate, cell increases in size

Question 18

S

Answer 18

DNA replicated in nucleus- semi-conservative

Question 19

G2

Answer 19

cells size, e stores increased

duplicated DNA checked for errors

Question 20

two stages of mitosis

Answer 20

mitosis- nucleus divides

cytokinesis- cyto divides and two cells produced

Question 21

G0

Answer 21

when cell permanently/ temporarily leaves cycle

Question 22

reasons for cell to leave cycle

Answer 22

differentiation- becomes spec so no longer able to divide
DNA being damaged
ageing- growing n’ senescence cells

Question 23

give an example of a type of cell that re-enters the cell cycle after G0

Answer 23

lymphocytes- WBCs- in an immune response

Question 24

diploid

Answer 24

when a cell has two chromosomes of each type

Question 25

origin of all cells that organisms dev from

Answer 25

zygote

Question 26

how many times does the nucleus divide in meiosis

Answer 26

twice

Question 27

why must gametes have a haploid number of chromosomes

Answer 27

otherwise the chromosome number of an organism would double with every round of reproduction

Question 28

haploid

Answer 28

containing half the number of chromosomes of the parent cell

Question 29

why is meiosis known as reduction division

Answer 29

reduces n' chromosomes to form a haploid cell

Question 30

can you describe the cell cycle

Answer 30

.

Question 31

can you explain how the cell cycle is regulated

Answer 31

.

Question 32

can you list the main stages of mitosis

Answer 32

prophase metaphase anaphase telophase

Question 33

what is meiosis a type of

Answer 33

nuclear division

Question 34

state which division in meiosis is a reduction division

Answer 34

.

Question 35

explain why a reduction division

Answer 35

.

Question 36

explain the meaning of the term homologous chromosomes

Answer 36

.

Question 37

outline how you could observe mitosis in a plant cell

Answer 37

.

Question 38

explain how crossing over and independent assortment lead to gen var

Answer 38

.

Question 39

recombinant chromosomes

Answer 39

.

Question 40

suggest the importance of the creation of different allele combinations in populations

Answer 40

.

Question 41

what do homologous chromosomes do before they separate

Answer 41

line up along the meta phase plate

Question 42

what does random independent assortment result in

Answer 42

many different combinations of alleles on either side of the metaphase plate

Question 43

what is the pole that parental h.chromo face due to

Answer 43

random independent assortment