Question

Use the drop-down menus to identify the cause of each chromosomal disorder. DiGeorge syndrome is a result of , where part of chromosome 22 is missing. results in males with three sex chromosomes, XXY, known as Klinefelter’s syndrome. Fragile X syndrome is a result of , which occurs when part of a chromosome breaks off and attaches to another chromosome.

Answer 1

DiGeorge syndrome is a result of Deletion
NONDISJUNCTION results in males with three sex chromosomes, XXY, known as Klinefelter’s syndrome.
Fragile X syndrome is a result of INSERTION

Answer 2

DiGeorge syndrome is a result of  a deletion on the 22nd chromosome. A mutation causes a loss of a part of the chromosome and  there is part of chromosome 22 is missing.
 
47,XXY karyotype, known as Klinefelter’s syndrome results in males with three sex chromosomes. This may occur as a result of sex chromosomes not being separated in meiosis of both of the mother or the father of the diseased.


Fragile X syndrome is a result of the expansion of trinucleotide repeats. This means that a sequence of three nucleotides is uncontrollably multiplying in the X chromosome sequence, causing various health problems and deformities. 
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