Monday, August 20, 2012

STPM Biology - chapter 17: Revision essay question 5

5. Explain the meaning of the following term:
(i) non-disjunction of chromosomes
(ii) polyploidy

Answer


(i) non-disjunction is the failure of homologous chromosome pairs or sister chromatids to segregate into different daughter cells during mitosis or meiosis. Both homologous chromosomes and sister chromatids end up in the same daughter cell during cell division.

(ii) poluploidy is an example of euploidy. It describe the condition of a nucleus, cell or organism that contains three or more complete sets of chromosomes. Polyploidy can be divided into autopolyploidy in which the three or more sets of chromosomes are derive from the same species and allopolyploidy when they are derive from different species.


Assignment submitted by L.Y., Kong,  S. H., Lim, S. C., Soo, C. W.

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