Cri-du-chat syndrome is caused by a deletion on chromosome 5; deletions occur when _____.

A) a portion of a chromosome is relocated onto a second chromosome
B) homologous chromosomes fail to separate during meiosis
C) a portion from the end or within the middle is lost
D) a son inherits a defective X chromosome from his mother
E) a section of chromosome breaks free but is reconnected to its chromosome in reverse order


Ans: C) a portion from the end or within the middle is lost

Biology & Microbiology

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