Answer-The change in chromosome number that involves the entire set, either by the loss or gain of one or m...

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The question is referring to changes in chromosome number that involve variations in the number of sets of chromosomes, which can be classified into different types based on how many copies of each chromosome are present    Nullisomic  Refers to the loss of an entire pair of chromosomes i.e., two chromosomes are missing from a diploid set. For example, in a nullisomic individual, the organism would have two fewer chromosomes than normal.    Monosomic  Refers to the presence of only one chromosome from a pair, instead of two. This means the individual has one chromosome missing from a particular pair e.g., 2n-1.    Trisomic  Refers to the presence of an extra chromosome, i.e., three chromosomes instead of the normal two for a particular chromosome pair e.g., 2n1.    Tetrasomic  Refers to the presence of four chromosomes from a particular pair, instead of the usual two e.g., 2n2.   Thus, all of these terms  nullisomic , monosomic , trisomic , tetrasomic  represent different types of chromosomal abnormalities involving changes in the number of chromosome sets or copies.

The change in chromosome number that involves the entire set, either by the loss or gain of one or more entire sets of chromosomes, is referred to as:

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