Q.With the help of diagrammatic representation, explain the process of gametogenesis. OR Describe the structure of cerebrum. Add a note on its functions.
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Start your 14-day free trial to unlock the full solution →Gametogenesis is the formation of haploid gametes from diploid germ cells via mitotic multiplication followed by meiosis: spermatogonium -> primary spermatocyte -> (meiosis I) secondary spermatocytes -> (meiosis II) s...
Gametogenesis produces haploid sperm/ova from diploid germ cells by mitosis then meiosis. OR: the cerebrum is the seat of voluntary control and higher mental functions.
Gametogenesis: This is the process by which haploid gametes are formed from diploid germ cells, occurring in two forms. In spermatogenesis (in the testis), diploid spermatogonia multiply by mitosis and grow into primary spermatocytes; each primary spermatocyte undergoes meiosis I to form two haploid secondary spermatocytes, which then undergo meiosis II to give four haploid spermatids; these spermatids undergo a differentiation process called spermiogenesis to transform into mature, motile spermatozoa. In oogenesis (in the ovary), diploid oogonia grow into primary oocytes; meiosis I is unequal, producing one large haploid secondary oocyte and a small first polar body (which may or may not divide further); the secondary oocyte is arrested at metaphase II and completes meiosis II only upon fertilization, yielding one haploid ovum and a second polar body. Thus, one primary spermatocyte gives four functional sperm, while one primary oocyte gives only one functional ovum (the polar bodies degenerate), because the bulk of the cytoplasm is retained by the single egg to nourish the future embryo. …
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