To solve this problem, we need to identify which cell during gametogenesis is normally diploid. Let's analyze each option:$\newline \bullet$Option 1: Primary polar body$\newline$ - The primary polar body is formed during the first meiotic division of oogenesis.$\newline$ - It is haploid because it results from the division of a diploid primary oocyte.$\newline$ - Therefore, the primary polar body is not diploid.$\newline \bullet$Option 2: Spermatid$\newline$ - Spermatids are formed after the second meiotic division in spermatogenesis.$\newline$ - They are haploid cells that will mature into spermatozoa.$\newline$ - Therefore, spermatids are not diploid.$\newline \bullet$Option 3: Spermatogonia$\newline$ - Spermatogonia are the initial germ cells in the male reproductive system.$\newline$ - They are diploid and undergo mitotic divisions to produce more spermatogonia or differentiate into primary spermatocytes.$\newline$ - Therefore, spermatogonia are diploid.$\newline \bullet$Option 4: Secondary polar body$\newline$ - The secondary polar body is formed after the second meiotic division of oogenesis.$\newline$ - It is haploid, similar to the ovum.$\newline$ - Therefore, the secondary polar body is not diploid.$\newline$Based on the analysis, the correct answer is Option 3: Spermatogonia, which are diploid cells.