A) chromosomal mutation
B) gene mutation
C) somatic mutation
D) polyploidy
Correct Answer: D
Solution :
Organisms with more than two sets of chromosomes are known as polyploids. It may be triploid with three sets of chromosomes (\[3n\]) or tetraploid with four sets of chromosomes (\[4n\]). They may be classified as primary and secondary. A primary polyploid is always even numbered because it arises by doubling of chromosomes of a particular organism, eg, \[\text{2n}\xrightarrow[\text{to}]{\text{doubled}}\text{4n}\,\text{or}\,\text{3n}\xrightarrow[\text{to}]{\text{doubled}}\text{6n}\,\text{etc}\text{.}\] Secondary polyploid arises by crossing between organisms of different ploidy levels, \[\text{4n}\,\text{(primary) }\!\!\times\!\!\text{ 2n}\xrightarrow[\,\text{rise}\,\text{to}]{\text{gives}}\text{Secondary}\text{.}\]
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