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Drosophilia melanogaster

fruit fly

sex chromosome

(genetics) a chromosome that determines the sex of an individual


any chromosome that is not a sex chromosome

sex linked trait

phenotypic expression of an allele related to the sex chromosome of an indivual

Linkage group

any pair of genes that tend to be transmitted together

map unit

a measure of the distance between two linked genes corresponding to a recombination frequency of one parent

gene mutation

a mutation due to an intramolecular reorganization of a gene


a change in the dna of an organism

addition mutation

is the addition of one or more nucleotide base pairs into a DNA sequence

insertion mutation

is the addition of one or more nucleotide base pairs into a DNA sequence

deletion mutation

is the removal of one or more nucleotide base pairs from a dna sequence

substitution mutation

is the replacement of one or more nucleotide base pairs in a DNA sequence

frame shift mutation

a mutation that results in the misreading of the code during translation because of a change in the reading frame

Germ cell mutation

a mutation that occurs in sex cells

somatic mutation

a mutation that occurs in a body cell

chromosome mutation

A change in the structure chromosomes or in the number of the chromosomes

chromosome deletion

the loss of a chromosome segment

chromosome inversion

breakage of a chromosome then repair is made with chromosoem in reversed position.

Chromosome translocation

A portion of a chromosomebreaks off and is transferred to another chromosome

chromosome non disjunction

failure of chromosomes to seperate during meiosis resulting in trisomy or monosomy offspring


a substance that changes the genetic material of an organism and increases the frequency of mutations

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