meiosis

Question 1

what is meiosis?

Answer 1

the process by which gametes (sex cells) are produced

Question 2

what is a gamete?

Answer 2

a specialised cell containing half the number of chromosomes of a normal body cell

Question 3

why do gametes only contain half the no of chromosomes of a normal body cell?

Answer 3

we get half the genetic information from father and half from mother

Question 4

importance of having half no of chromosomes:-

what happens when the two specialised cells combine?

Answer 4

we get one complete set of DNA rather than double the amount we need

Question 5

start with what?

Answer 5

an original body cell

Question 6

what happens after the original body cell has undergone meiosis?

Answer 6

two identical daughter cells

Question 7

what happens to the two identical daughter cells?

Answer 7

they separate into 4 gametes each with half the normal amount of chromosomes

Question 8

how is meiosis different to mitosis

Answer 8

meiosis forms 4 daughter cells

mitosis forms 4

Question 9

meiosis process

start-

Answer 9

one cell 46 chromosomes

Question 10

meiosis process

step 1

Answer 10

all of the chromosomes are copied

Question 11

meiosis process

step 2

Answer 11

the chromosomes aline in the centre of the nucleus

Question 12

meiosis process

step 3

Answer 12

spindle fibres attach to the chromosomes and the duplicate pairs are split apart,as they move to the opposite sides of the cell

Question 13

meiosis process

step 4

Answer 13

a new nuclear membrane forms around the two sets of chromosomes

Question 14

meiosis process

step 5

Answer 14

the cell splits into two,both identical copies of each other

Question 15

meiosis process

step 6

Answer 15

each daughter cell splits into two cells/
the dna is not replicated.
this means each new cell ends up with half the normal amount of dna

Question 16

what do you end with after the process?

Answer 16

four cells,23 chromosomes each
23 from mother
23 from father