Achondroplasia.

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Presentation transcript:

Achondroplasia

Karyotypes and Nondisjunction

Karyotype Picture of a persons’ chromosomes Reveals extra or missing chromosomes Allows doctors to detect some genetic disorders

Karyotypes Picture taken during metaphase of mitosis Chromosomes are condensed and consist of 2 sister chromatids DNA is stained prior to taking the picture. Similar DNA sequences glow similarly Arranged by decreasing size

Telomeres They serve a protective function The ends of a chromosome Their degradation leads to aging and cancer

Nondisjunction

Nondisjunction Occurs when Sister Chromatids fail to separate Can happen in Meiosis I or Meiosis II Wrong number of chromosomes in a gamete

Nondisjunction Down syndrome occurs because of an extra chromosome 21

Down syndrome Occurs because of nondisjunction Also called trisomy 21

Nondisjunction

Monosomy Only 1 of a particular chromosome

Nondisjunciton and Sex Chromosomes

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