BIOL 239 Lecture 7: editedFont_BIOL239set7 chromosome number
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17 Feb 2016
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1
BIOL 239
Changes in chromosome number
Chapter 6 pg 175-176,
303-311
Aneuploidy
Aneuploidy results from the loss or
gain of one or more chromosomes
2
Aneuploids – individuals whose
chromosome number is not an exact
multiple of the haploid number (n) for the
species
Aneuploidy
Monosomic – refers to individuals lacking
one chromosome from the diploid number
(2n-1)
3
Trisomic – refers to individuals having
one chromosome in addition to the diploid
set (2n+1)
Tetrasomic – refers to individuals having
four copies of a particular chromosome
(2n+2)
Aneuploidy
Autosomal aneuploidy is generally
deleterious to the organism.
Monosomy is generally lethal in humans.