deletion (in genetics)
1. A point mutation involving the removal of one or more base pairs in the DNA sequence.

2. A frequently lethal chromosome mutation that arises from an inequality in crossing over during meiosis such that one of the chromatids loses more genetic information than it receives.

deletion The loss of a chromosomal segment from a chromosome set. The size of the deletion may vary from a single nucleotide to sections containing several genes. If the deletion is from the end of a chromosome, it is called ‘terminal’; if it is from elsewhere, it is termed ‘intercalary’.

deletion The loss of a chromosomal segment from a chromosome set. The size of the deletion may vary from a single nucleotide to sections containing several genes. If the deletion is from the end of a chromosome, it is called ‘terminal’; if it is from elsewhere, it is termed ‘intercalary’.

deletion The removal of one or more nucleotides from a DNA sequence.