B deletion of chromosomes
C translocation of chromosomes
Common Chromosomal Abnormalities and their Frequencies
D insertion of chromosomes
Name of Abnormality
Trisomy 21 (Down Syndrome)
Trisomy 18 (Edwards Syndrome)
Trisomy 13 (Patau Syndrome)
Monosomy X (Turner Syndrome)
Kinefeter's Syndrome
The table above shows five different types of chromosomal abnormalities that can occur during meiosis. They result in either an individual having too many or too few chromosomes in their genome. What is the
most likely cause of these chromosomal abnormalities?
4x
Anondo junction of chromosomes
O
Chromosomal Abnormality
extra copy of chromosome 21
extra copy of chromosome 18
extra copy of chromosome 13
1/16000
only one sex chromosome, only the X chromosome 1/2500
extra X sex chromosome
1/750
€
O
U
Frequency
Co
3
1/800
1/5000
B33
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Jan 20
2:59 O