Chromosome numbers in meiocytes (diploid, 2n) and gametes (haploid, n) of some organisms are given below. Fill in the blank spaces.
$\begin{array}{ccc}\text{Name of organism}& \text{Chromosome number in meiocyte (2n)}& \text{Chromosome number in gamete (n)}\\ \text{Human beings}& \text{46}& \text{23}\\ \text{House fly}& \text{12}& \\ \text{Rat}& & \text{21}\\ \text{Dog}& \text{78}& \\ \text{Cat}& & \text{19}\\ \text{Fruit fly}& \text{8}& \\ Ophioglossum\left(afern\right)& & \text{630}\\ \text{Apple}& \text{34}& \\ \text{Rice}& & \text{12}\\ \text{Maize}& \text{20}& \\ \text{Potato}& & \text{24}\\ \text{Butterfly}& \text{380}& \\ \text{Onion}& & \text{8}\end{array}$

1: Meiocytes The type of cell that usually undergoes meiosis to form gametes is known as meiocyte. By meiosis, a diploid meiocyte (2n) divides to form haploid gametes (n).
$\begin{array}{ccc}\text{Name of organism}& \text{Chromosome number in meiocyte (2n)}& \text{Chromosome number in gamete (n)}\\ \text{Human beings}& \text{46}& \text{23}\\ \text{House fly}& \text{12}& \text{6}\\ \text{Rat}& \text{42}& \text{21}\\ \text{Dog}& \text{78}& \text{39}\\ \text{Cat}& \text{38}& \text{19}\\ \text{Fruit fly}& \text{8}& \text{4}\\ Ophioglossum\left(afern\right)& \text{1260}& \text{630}\\ \text{Apple}& \text{34}& \text{17}\\ \text{Rice}& \text{24}& \text{12}\\ \text{Maize}& \text{20}& \text{10}\\ \text{Potato}& \text{48}& \text{24}\\ \text{Butterfly}& \text{380}& \text{190}\\ \text{Onion}& \text{16}& \text{8}\end{array}$