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Polyploidy
- 1. ANN MARY MATHEW BGS051705 M.Sc. IRST YEAR CENTRAL UNIVERSITY OF KERALA
- 2. WHAT IS CHROMOSOMAL VARIATION ???? HOW IT OCCURS……..? Error during cell division, replication, crossing over Cause variation in structure and number
- 6. POLYPLOIDS PLOIDY - the number of sets of chromosomes in cell, or in the cells of an organism POLPLOIDY - more than two sets of chromosomes are present polyploidy autopolyploid Addition of one more extra sets of chr. From same spp. allopolyploidy Combination of chr. sets b/w different spp.
- 8. Autotriploids In experimental coditions.. Diploid tetraploid 3n •Offsprings prodused by autotriploids are sterile n 2n
- 10. Autotetraploids produced experimentally by • cold/heat shock to meiotic cells • colchicine treatment to somatic cells Chromosome replicated no cell division reenters interphase chromosome number douled The autopolploids are relatively larger than their diploid relatives, this increased size making them with greater commercial or horticultural value.
- 11. CHROMOSOME PAIRING IN AN AUTOTETRAPLOID
- 13. How the cells increases in size?????? Gerald Fink study on Saccharomyces cerevisiae G1 CYCLINS
- 14. GENETIC RATIOS PRODUCED BY TETRAPLOIDS Assume that, the tetraploids only produce bivalents. If we start with an A/A/a/a tetraploid plant and self it, what proportion of progeny will be a/a/a/a ?
- 16. Origin of three alloploid species o Brassica Allopolyploidy is important in the production o new species. In the example shown, three diploid species of Brassica (light green boxes) we crossed in different combinations to produce their allopolyploids(tan boxes).some of the agricultural derivatives of some species are shown within the boxes.
- 20. Autotriploidy
- 21. Allopolyploidy