Film: 9097

Science | 1970 | Sound | Colour

Clip:

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Synopsis:

This film is about meiosis (cell reproduction)

Animation showing spermatozoa "swimming" to the ovum (egg). The spermatozoa penetrates the egg membrane and the male nucleus unites with the female nucleus forming a new individual. Can observe, in animation, the new nucleus dividing into two new cells. The female egg and the spermatozoid are both haploid cells (each contain a number of chromosomes), the fusion cell (the fertilized egg) contains 2n chromosomes, therefore it is called diploid. All cells have the diploid number of chromosomes, one set from the father and one set from the mother. The fruit fly has two sets of four chromosomes, therefore 2n = 8, man has 2n = 46. Homologous spermatozoids are formed by the division of the homologous chromosomes which give rise to four different n cells. Live microscopic examination of spermatogenesis of the fruit fly, we can observe the first division and spindle fibres, homologous chromosomes dividing thus giving rise to four daughter cells. Diagram of the male spermatogenesis (meiosis). Diagram of one of the pair of homologous chromosomes, showing four chromatids exchanging genes (crossing over). The whole process of meiosis is shown in an animated diagram. Live observation of meiosis under the light microscope. Animation of the maturing of a spermatozoa. Animation of the formation of the female egg cell, showing the formation of polar bodies. Animation showing fertilization.


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