Meiosis

Question 1

What cells does meiosis make

Answer 1

gametes(sperm and egg)

Question 2

Meiosis contributes to …..

Answer 2

genetic variation

Question 3

How many chromosomes do gametes have

Answer 3

23

Question 4

reduction division

Answer 4

Divides twice so

starting cell - 46 ending cell (gametes) - 23

Question 5

what happens before meiosis

Answer 5

interphase

Question 6

what happens during interphase

Answer 6

carry out cell functions
growth
DNA replication

Question 7

What are the steps of meiosis

Answer 7

PI, MI, AI, TI, PII, MII, AII, TII

Question 8

What happens during prophase I

Answer 8

• chromosomes condense and thicken

- line up with their homologous pairs

Question 9

Homologous pairs?

Answer 9

same size and same type of genes in same locations

Question 10

what happens during ‘crossing over’

Answer 10

chromosomes lined up in homologous pairs and transfer genetic info and exchange it between each other

Question 11

recombinant chromosomes? what does it contribute to ?

Answer 11

• chromosomes that have transferred genetic info between each other
• genetic variety in siblings

Question 12

metaphase I?

Answer 12

chromosomes in the middle of the cell in PAIRS

Question 13

Anaphase I

Answer 13

pulled to the poles by the spindle fibres

Question 14

AnaphaseII

Answer 14

pulled to the poles by the spindle fibres

Question 15

telaphase I

Answer 15

two nuclei

Question 16

prophase II

Answer 16

spindles form

both nuclei break down

Question 17

metaphase II

Answer 17

chromosomes line up in SINGLE FILE LINE

Question 18

Anaphase II

Answer 18

CHROMATIDS pulled away by spindle fibres

Question 19

Telaphase II

Answer 19

nuclei reforming

4 cells forming

Question 20

Non- disjunction?

Answer 20

• Chromosomes dont separate correctly
• Cell can receive too many or too little chromosomes
• contributes to gentic disorders