This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Independent assoment of maternal and paternal chromosome occurs at which stage of spermatocyte maturation: 
Select and explain. 
A. Spermatogonia to primary spermatocyte, B. Primary spermatocyte to secondary spermatocyte, C. Secondary spermatocyte to spermatids, D. Spermatid to spermatozoa
B: Primary spermatocyte to secondary spermatocyte
Answer: B: Primary spermatocyte to secondary spermatocyte 
Explanation: Ans: B. Primary spermatocyte to secondary spermatocyteDuring spermatogenesis - Independent assoment of paternal & maternal chromosomes occurs during meiosis I.Also, primary spermatocyte (2n) is conveed into two secondary spermatocytes.