Biotechnology - Cell Cycle - Discussion

Please explain briefly.

Chromosomes undergo duplication during s phase. So, chromosomes appear with two chromatids. Therefore in 46 chromosomes there are 92 dna as well as 92 chromatids.

Chromosomes consist of two identical strands called chromatids formed during S phase so 46 chromosomes mean 92 chromatids.

The diploid body cells contain 46chromosomes and the no. of chromatids is just double of the number of chromosomes i.e..92.

In meiosis for the gamete cell to obtain the haploid condition the half set of the chromosomes are removed as polar body. So the parent cell contain diploid in nature i.e., 2n 46 chromosomes. But in mitosis the daughter cells must retain the diploid condition. The 46 chromosomes are replicated and are distributed to the daughter cells. But 92 represents tetraploid nature i.e., 4n nature. This is seen only when there is defect in distribution of chromosomes. This is mainly seen in triticum aestivum. Please explain the answer how it is 92.

Haploid cells contain 1 set of chromosomes in their nuclei. Diploid cells contain 2 sets of chromosomes in their nuclei. The human species contain 46 chromosomes in their nuclei. This is the diploid (2n) number. The sex cells of the species have 23 chromosomes in their nuclei. This is the haploid (n) number. When fertilisation takes place the 23 chromosomes (n) from the father (called Paternal chromosomes) and the 23 chromosomes (n) from the mother (called the Maternal chromosomes) combine to form the diploid (2n=46) number of chromosomes in the fertilised egg cell.

Just prior to cell division it is diploid but please explain it for which organism chromosome no is 92.