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biología completar eso Âge recommandé: 15 ans
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genetics

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Rocío Mancilla Romero
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chromosomes Deletion material divisions extra chromosome pair change number missing alterations living structure Translocation DNA positive genes mutations

Mutations are in the genetic that have negative , or no consequences at all for the organisms in which they occur . They are due to errors in replication or abnormal distributions in cell . They can be chromosome or gene , depending on where they occur .

CHROMOSOME MUTATIONS
These are alterations which affect large segments of or entire chromosomes and , therefore , many . They can be structural or numerical .

STRUCTURAL MUTATIONS
These are due to the appearance of two breakages in nuclear chromosomes at the same time .

is the loss of a chromosomal segment .

Inversion is the in direction of the chromosomal segments .

is caused when a segment splits off from a chromosome and exchanges with the segment of a non - homologous chromosome .

NUMERICAL MUTATIONS
These affect the normal of chromosomes of a species without affecting their .

? Nullisomy appears when a of homologous chromosomes is in an organism .
? Monosomy occurs when a is missing from each of the homologous pairs .
? Trisomy is the existence of an chromosome in a pair of homologous chromosomes .