MEIOSIS

Question 1

• MEIOSIS ONE ?

Answer 1

• it is the base of any sexual reproduction .

Question 2

• what happen in meiosis ?

Answer 2

• the gametes have haploid number of chromosomes ,
• then the gametes becomes a diploid number of chromosomes during a process called “ fertilization “ .
• then we can have the “ zygote “ .

Question 3

• what is the “ zygote “ ?

Answer 3

• its the complete process of the fertilization

- haploid-sperm + haploid-egg = diploid-zygote .

Question 4

• what is the “ replication of chromosomes “ ?

Answer 4

• its the process of DNA´s synthesis and condensation

- un replicated chromosome —- DNA synthesis and condensation —- “DYAD” 2 sister chromatids .

Question 5

• where does the sister chromatids connect ?

Answer 5

• the sister chromatids are connected in the centromere area .

Question 6

• when does the replication occurs ?

Answer 6

• the replication occurs in the interphase during S-phase .

Question 7

• stages of meiosis one/two ?

Answer 7

• prophase one/two
• metaphase one/two
• anaphase one/two
• telophase one/two

Question 8

• early prophase one ?

Answer 8

• chromosomes becomes in pairs
• crossing over occurs
• chiasmata “ its an exchange of the genetic-info between both chromatids “ ( genetic recombination ) .

Question 9

• late prophase one ?

Answer 9

• chromosomes becomes condense ,
• appearance of spindle strings/fibers ,
• nuclear envelope fragments .

Question 10

• metaphase one ?

Answer 10

• spindle fibers begins to capture the homologous pairs of chromosomes ,
• homologous pairs are organized in the center .

Question 11

• anaphase one ?

Answer 11

• homologous chromosomes separate and move into opposite poles .
• the sister chromatids remain connection at their centromeres .

Question 12

• telophase one ?

Answer 12

• nuclear envelopes reappear
• each group of homologous chromosomes move to the opposite pole
• spindle fibers disappears
• cytokinesis divides the cells into two .

Question 13

• MEIOSIS TWO ?

Answer 13

• meiosis ii is similar to “ mitosis “ .
• except one thing, the cells have the half number of chromosomes . ( haploid number ) .
• before meiosis two DNA replication does not occur .
• the interphase is short .
• four identical haploid cells .

Question 14

• prophase two ?

Answer 14

• nuclear envelope disappear ,

- spindle fibers forms .

Question 15

• metaphase two ?

Answer 15

• spindle fibers are connected in the centromere .

- the chromosomes are located in the meddle of the cell .

Question 16

• anaphase two ?

Answer 16

• the centromere breaks down and separate the chromatids ,

- each chromatid move into the opposite pole .

Question 17

• telophase two ?

Answer 17

• nuclear envelopes reappears ,

- four cells form in this phase .

Question 18

• what is the tetrad, when does tetrad happen exactly ?

Answer 18

• its when the chromosomes are attached ,

- in exact point called ( synapsis ) .

Question 19

• how much division in the mitosis ?

Answer 19

• there is one division .

Question 20

• how much division in the meiosis ?

Answer 20

• there is two division .

Question 21

• the number of produced cells in case of mitosis ?

Answer 21

• two produced cells .

Question 22

• the number of produced cells in case of meiosis ?

Answer 22

• four produced cells .

Question 23

• the genetic match in case of mitosis ?

Answer 23

• there is no genetic match .

Question 24

• the genetic match in case of meiosis ?

Answer 24

• there is no genetic match .

Question 25

• the number of chromosomes in case of mitosis ?

Answer 25

• complete number of chromosomes ( diploid number )

Question 26

• the number of chromosomes in case of meiosis ?

Answer 26

• the half number of chromosomes ( haploid number ) .

Question 27

• the mitosis division occur in ?

Answer 27

• the mitosis division occur in ( somatic cells ) .

Question 28

• where does the meiosis division occur ?

Answer 28

• the meiosis division occur in ( germ cells ) .

Question 29

• when does the mitosis happen ?

Answer 29

• it happen during live .

Question 30

• when does the meiosis happen ?

Answer 30

• it happen in sexual maturity .