In the laboratory, it is possible to culture the pollen of some angiosperm plants and produce...

In the laboratory, it is possible to culture the pollen of some angiosperm plants and produce a fully differentiated plant individual that does not result from fertilization. This plant individual produces perfect flowers but is sterile. By treatment with colchicine, the plant produced from non fertilization can be made "artificially" diploid and now the plant is fertile. How can you explain the haploid angiosperm is sterile and when made diploid becomes fertile?

Expert Solution

Haploid have only a single set of chromosomes whereas diploid have two sets of chromosomes.

Pairing of chromosomes during prophase 1 of meiosis 1 is not possible in case of haploid and therefore the segregation of chromosome from each other during anaphase 1 will not take place properly in case of haploid. This will result in the formation of gametes which will have a few chromosomes only. The gametes will be inviable since all the chromosomes are required for the survival of the individual.

But if we use colchicine for chromosomal doubling, then the number of chromosomes get doubled in the haploid. This results in the formation of diploid species in which there are two sets of chromosomes. All the chromosomes now have one pairing partner. They will pair during prophase 1 and will segregate from each other during anaphase 1. This will result in the formation of gametes having one chromosome of every type. Therefore the gametes will be viable.

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gladiator answered 2 years ago

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