7. What are the main diseases
caused by errors of the
number of sex chromosomes
in the cells of an individual?

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Diseases caused by abnormal of
sex chromosomes are sex
aneuploidies.

The main aneuploidies are: 44 +
, or trisomy X (women cells
have an additional chromosome); 44
+ XXY, Klinefelter's syndrome (men
whose have an extra X
); 44 + XYY, or Y
syndrome (men whose have an
additional Y ); 44 + X,
Turner’s (women whose cells
lack X chromosome).