In which two ways numericalchanges occur in the chromosomes?
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.Numerical change in chromosome or variations in chromosome number (heteroploidy), can be mainly of two types, namely (i) aneuploidy and (ii) euploidy. (a) Aneuploidy: ... The aneuploids arise due to failure of the separation of homologouschromosomes of particular pair during meiosis. It is known as non-disjunction.
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a) Aneuploidy: Aneuploidy is the condition when the organisms have either extra or missing chromosome from the diploid set of chromosomes. It can be referred to as 2n-1, 2n+1, 2n-2. Examples: Down syndrome, Turner's syndrome etc
(b) Euploidy: Euploid is the complete set of chromosomes for a species. In humans, the euploid number of chromosomes is 46. If there is addition or loss of complete one set (n) or more than one set of chromosomes, it is referred as aneuploidy. Example: hexaploid (6n) wheat, Octaploid(8n) strawberries.
(b) Euploidy: Euploid is the complete set of chromosomes for a species. In humans, the euploid number of chromosomes is 46. If there is addition or loss of complete one set (n) or more than one set of chromosomes, it is referred as aneuploidy. Example: hexaploid (6n) wheat, Octaploid(8n) strawberries.
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