Doesn't a diploid cell has 46 chromatids and duplicate in to 92 chromotids?
why do people say 46 chromosomes in a deploid cell?
In human diploid cells, there are 23 homologous sets of two chromosomes (=46). Each chromosome is composed of one DNA molecule.
In the replication stage, each chomosome is duplicated into two chromatids (two DNA molecules), but are still attached by the centromere, so there are still 46 chromosomes (or dyads) each containing two sister chromatids. Sister chromatids are generally identical, unless a mutation has occurred.
Later on during the anaphase of either mitosis or meiosis, the sister chromatids separate and become daughter chomosomes (92 total). Thus the stage where 92 chromosomes exist in a single cell occurs only for a short period of time during replication or reproduction.
I'll explain why people say a diploid cell has 46 chromosomes and clarify the concept of chromatids.
In a diploid cell, there are indeed 46 chromosomes. Chromosomes are the structures that carry genetic material and are typically found in pairs within most human body cells. When we refer to the number of chromosomes in a diploid cell, we count the individual chromosomes, not the chromatids.
Now, chromatids are formed when a chromosome is replicated during the cell division process. Before cell division occurs, each chromosome duplicates, resulting in two identical copies called sister chromatids. These chromatids remain attached at a region called the centromere. Collectively, the sister chromatids represent a single chromosome.
During cell division, the sister chromatids separate and move to opposite poles of the dividing cell. This process, known as mitosis, ensures that each daughter cell receives an identical set of chromosomes.
So, to answer your question, the number of chromatids in a diploid cell is 92 when it undergoes replication. However, when people say there are 46 chromosomes in a diploid cell, they are referring to the total number of individual chromosomes present, not the doubled number of chromatids.
It's essential to distinguish between chromatids and chromosomes to understand the genetic makeup of cells accurately.