Zero...bcz there are single set of chromosome in haploid cell...so there is no pairing...

A haploid cell has half the number of chromosomes as compared to a diploid cell. In humans, a diploid cell has 46 chromosomes, and a haploid cell has 23 chromosomes.

In this case, the haploid cell has 50 chromosomes. This means that it is not a normal haploid cell, but instead, it has undergone a process of duplication called polyploidization.

Polyploidization is a process in which the number of chromosomes in a cell is multiplied beyond the normal diploid number. In this case, the haploid cell has undergone polyploidization and has become a tetraploid cell with 4 sets of chromosomes.



To find the number of homologous chromosome pairs in a tetraploid cell with 50 chromosomes, we can use the formula:

n = number of chromosomes / ploidy level

where n is the number of chromosomes in each set and ploidy level is the number of sets of chromosomes.

For this cell,

n = 50 / 4 = 12.5

Since chromosomes cannot be in half numbers, we need to round it down to the nearest whole number, which is 12.

Therefore, in metaphase, a haploid cell with 50 chromosomes will have 6 pairs of homologous chromosomes.



In conclusion, a haploid cell with 50 chromosomes is not a normal haploid cell, but instead, it has undergone polyploidization and has become a tetraploid cell. In metaphase, this cell will have 6 pairs of homologous chromosomes.