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Human genetic disorders notes
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This a note for the biology lesson human genetic disorders for freshmen high school students
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- leads to chromosomal abnormality; where the chromsome number is LESSor MORE than 46 chromosomes
Homologous chromosomes Sister chromatids
fail to seperate during fail to seperate
anaphase l of meiosis l during anaphase ll
meiosis ll
meiosis l
seperation of homologous seperation of sister
chromosomes during chromatids during
anaphase l anaphase ll
Abnormal number Abnormal number of
of chromosomes chromosome Abnormal number
(+ an extra (- missing a Normal
chromsome) of chromosomes number of
chromosome)
1-( an extra chromosome
chromosome ) s
2-( a missing
chromosome)
= 47 chromosomes = 45 chromosomes
(abnormal) (abnormal)
47 chromosomes 45 chromosones
46 chromosomes
Human genetic disorders caused due to nondisjunction
Down syndrome Klinefelter’s
(Trisomy 21) Turner’s syndrome syndrome
, • Caused due to
nondisjunction during the
process of meiosis
due to the defect of genes present on the
autosome chromosome
⭐Down Syndrome (Trisomy 21): a
genetic disorder caused by an extra
copy of chromosome number 21
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