Available online
Description
The process of re-shuffling of genetic characteristics in sexual reproduction to form novel recombinations is examined.
The process of re-shuffling of genetic characteristics in sexual reproduction to form novel recombinations is examined.
| Module code and title: | S299, Genetics |
|---|---|
| Item code: | S299; 03 |
| First transmission date: | 15-03-1976 |
| Published: | 1976 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:00 |
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| Producer: | Roger Jones |
| Contributor: | Robert Whittle |
| Publisher: | BBC Open University |
| Keyword(s): | 3-dimensional models; Cell division; Chromosomes; Differentiation; Fertilisation; Gametes; Genes; Growth; Meiosis; Tradescantia |
| Footage description: | As an introduction, Robert Whittle "talks" to his mirror image in the studio. He points out the biological uniqueness of an individual. In order to demonstrate the slim chance of two individuals with identical genotype occurring, Whittle uses a mag board to display four possible unique zygotes combinations for one chromosome pair. Time-lapse film, under magnification, shows meiosis in pollen cells of Tradescantia. Commentary by Whittle explains what is happening. The different phases of meiosis are shown again, this time using still photographs. Commentary by Whittle continues. Finally, the time lapse film is shown again. Whittle, with a model of a salamander sperm cell in interphase, explains what activity takes place in the nucleus during this phase. Still shots of a stained, fixed salamander sperm nucleus in various phases of meiosis. Commentary by Whittle explains what is happening. Using a series of models, some animated, of homologous chromosomes closely paired as bivalents, Whittle demonstrates the meiosis process. Whittle goes on to explain how breakage of chromatids occurs and how these recombine to form new recombinant chromosomes. He uses a model and animation to help illustrate his points. |
| Master spool number: | 6HT/71808 |
| Production number: | 00525_1171 |
| Videofinder number: | 992 |
| Available to public: | no |
