Biology

Question 1

To justify that this is telephone 1 in the question we say :

Answer 1

Since each daughter cell encloses in its nucleus a chromosome of 2 chomatids

Question 2

Why is meiosis a reductional division?

Answer 2

Since the number of chromosomes in mother cell a and its reduced into half ( 2 chromosomes)in cell c, so the division is a reductional division.

Question 2

Why is meiosis a reductional division?

Answer 2

Since the number of chromosomes in mother cell a and its reduced into half ( 2 chromosomes)in cell c, so the division is a reductional division.

Question 3

Meiosis: prophase 1

Answer 3

-Pairing up of homologous chromosomes (formation of tetrads) and the chromosomes are condensed ,visible, made up of 2 chromatids
-Disappearance of nuclear membrane
-Formation of two asters
-Formation of spindle fibers

Question 4

Meiosis: Metaphase 1

Answer 4

•the homologous chromosomes form the equatorial plate.

Question 5

Meiosis: Anaphase 1

Answer 5

•Seperation of homologous chromosomes
•Migration of each chromosome towards the opposite poles of the cell due to polar ascension
•The chromosomal group 2n is thus reduced to n chromosomes in the daughter cells (n double chromosomes at each pole

Question 6

Meiosis: Telophase 1

Answer 6

•Formation of a nuclear membrane at each pole ,surrounding (n) chromosomes with 2 chromatids each
•Disappearance of asters and spindle fibers
•Constriction of the cell at the level of the median plane
•Division of the cell into two daughter cells each containing n=3 chromosomes at telophase1

Question 7

Meiosis: prophase 2

Answer 7

•In each if the two cells resulting from meiosis 1, the chromosomes are condensed,visible , and in two chromatids
•Disappearance of nuclear membrane
•Formation of two asters
•Formation of spindle fibers

Question 8

Meiosis: metaphase 2

Answer 8

The chromosomes form the equatorial plate in each cell (1-2)

Question 9

Meiosis: Anaphase 2

Answer 9

•Seperation of sister chromatids
•Migration of each sister chromatid towards opposite poles due to polar ascension
•Formation of a lot of chromosomes (n) at each pole

Question 10

Meiosis: Telophase 2

Answer 10

•Formation of a nuclear membrane at each pole , surrounding n single chromosomes.
•Disappearance of asters and spindle fibers
•Constriction of the cytoplasmic membrane
•Each cell is divided into two gametes
•Four haploid cells are produced at the end of meiosis

Question 11

Cell cycle:
Cell division:

Answer 11

Cell cycle: +interphase
Cell division: ⛔️interphase

Question 12

Justify that meiosis is a reductional division.

Answer 12

Meiosis is a cell division where the mother cell produces haploid cells with half the number of chromosomes of the diploid one. THIS indicates that meiosis is a REDUCTIONAL DIVISION