You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Spermatogenesis begins at - and explain in detail?
Ans. is 'c' i.e., Puberty o Spermatogenesis refers to the process of formation of spermatozoa (sperm) from primitive germ cells (spermatogonia).o Spermatogenesis begins at puberty and continues throughout adult life to decline in old age.o In humans, it takes an average of 74 days to form a mature sperm from primitive germ cells.o Spermatogenesis occurs in seminiferous tubules.o Steps in spermatogenesis involve :i) Spermatogonia (primitive germ cells) undergo mitosis to form primary spermatocytes. Both spermatogonia and primary spermatocytes have diploid chromosomes (46 chromosomes or diploid of 23 chromosomes).ii) Primary spermatocytes undergo meiosis to form secondary spermatocytes. Secondary spermatocytes have haploid (23) chromosomes.iii) Secondary spermatocytes undergo mitosis to form spermatids.iv) Spermatids do not divide further but undergo morphological changes to form sperms (spermatozoa). This step of formation of spermatozoa from spermatids is called spermiogenesis. The spermiogenesis takes place in the deep folds of cytoplasm of sertoli cells.