Answer:
6 pairs of chromosomes
Explanation:
The cell cycle consist of 4 phases:
G1 Phase
S Phase
G2 Phase
M Phase
G1 Phase
In the G Phase cell duplicates its organelles. In the example the cell has 6 pairs of chromosomes. In every pair of chromosomes one chromosome comes from the father and one chromosome comes from the mother. Although these chromosomes carry similar genetic information there are some differences between them.
S Phase
In the S Phase each chromosome is duplicated
In the example the cell has 12 pairs of chromosomes. Since each chromosome has a identical copy, they are called sister chromatids.
G2 Phase
In G2 phase cell prepares for mitosis. In the example the cell has 12 pairs of chromosomes.
M Phase
The M phase in the Meiosis is divided in Meiosis 1 and Meiosis 2
In Meiosis 1 pairs of sister chromatids align and undergo homologous recombination. For chromosome 1 , 2 pairs of sister chromatids align and mix their genetic content. In the example the cell has 12 pairs of chromosomes. At the end meiosis 1, 6 pairs of chromosomes goes to one side of the cell and the other 6 pairs of chromosomes go to opposite side of the cell. Finally the cell divides and two cells are formed, each cell has 6 chromosomes.
At the metaphase 2 Meiosis each pairs of homlogous chomosomes is aligned al the center of the cell. In the example you have 6 pairs of chromosomes in each cell aligned at the center.
