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Gametogenesis

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The process of formation gametes in sexually reproducting animal is called gametogenesis.
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Draw a labelled diagram of a sectional view of humen seminiferous tubule. (b) Differentiate between gametogenesis in humen males and females on the basis of (i) time of initation of the process. (ii) Products formed at the end of the process.

Knowledge Check

  • Which of the following statement(s) regarding gametogenesis is/are wrong? I. The spermatogonia multiply by mitotic divison and increase In numbers. II. Gametogenesis occur in gonads. III.LH acts the Leydig cells and stimulates synthesis and secretion of estrogens. IV. Gametogenesis involves the meiotic divison. V. FSH acts on the Sertoli cells and stimulates secretion of androgens.

    A
    II and IV only
    B
    III and V only
    C
    I,II and III only
    D
    III only

  • Match Column-I with Column-II and select the correct option using the codes given below {:(,"Column-I",,"Column-II"),("(A)","Pistils fused together","(i)","Gametogenesis"),("(B)","Formation of gametes","(ii)","Pistillate"),("(C)","Hyphae of higher Ascomycetes","(iii)","Syncarpous"),("(D)","Unisexual female flower","(iv)","Dikaryotic"):}

    A
    `{:("(A) (B) (C) (D)"),("(iii) (i) (iv) (ii)"):}`
    B
    `{:("(A) (B) (C) (D)"),("(iv) (iii) (i) (ii)"):}`
    C
    `{:("(A) (B) (C) (D)"),("(ii) (i) (iv) (iii)"):}`
    D
    `{:("(A) (B) (C) (D)"),("(i) (ii) (iv) (iii)"):}`

  • Which of the following statement/s regarding gametogensis is/ are wrong ? I. Gametogensis refers to the process of formation of the two types of gametes. II. Gametogenesis occurrs is gonads. III. In a majority of sexually reproducing organisms the gameter produced are of morphologically in simialr types (isogametes). IV. Gametogenesis involves the meictioc divison . V. The male gamtes is called the antheroid or sperm and the female gamete is called the egg or ovum.

    A
    II and IV only
    B
    III and V only
    C
    I, II and III only
    D
    III only

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    mark the wrong items in each series - (i) scrotum rete testis , fallopian tube , vas deferens . (ii) Ovary , uterus , vagina , ejculatory duct. (iii) acrosome , Graafian follicle , corpus luteum , cervix . (iv) Fission , budding , fragmentation , gametogenesis . (v) Prostate tesis , seminal vesicles cowper's gland .

    (a) Give a schematic representation of spermatogenesis in humans. (b) At which stage of life does gametogenesis begin in human male and female respectively ? (c) Name the organs where gametogenesis gets completed in human male and female respectively?

    (a)Give a schematic representation of spermatogenesis in humans . (b) At which stage of life does gametogenesis begin in human male and female respectively ? (c )Name the organs where gametogensis gets completed in male and female respectively.

    Do all the gametes formed from a parent organism have the same genetic composition (identical DNA copies of th parental genome)? Analyse the situation with the background of gametogenesis and provide or give suitable explanation.

    Which of the following statements are correct regarding sterilisation? I. Sterilisation is a form of permanent contraception. II. Sterilisation inhibits gametogenesis. III. Sterilisation can be done both in males and females. IV. Tubectomy is the sterilisation procedure done in males.

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