In mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis.  Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes.  Males with an extra Y chromosome (XYY) occasionally are found due to inappropriate segregation of the chromosomes (i.e. non-disjunction). Which of the following could give rise to such an XYY male?  Answer Yes or No for each situation.  nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother        nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother        nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father        nondisjunction in the second meiotic division of oogenesis; normal meiosis in the father

Human Anatomy & Physiology (11th Edition)
11th Edition
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Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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In mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis.  Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes.  Males with an extra Y chromosome (XYY) occasionally are found due to inappropriate segregation of the chromosomes (i.e. non-disjunction). Which of the following could give rise to such an XYY male?  Answer Yes or No for each situation. 

  1. nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother       
  2. nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother       
  3. nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father       
  4. nondisjunction in the second meiotic division of oogenesis; normal meiosis in the father       
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