Why Might the Incidence of Trisomy from Maternal Origin Be

question 33

Multiple Choice

Why might the incidence of trisomy from maternal origin be higher than that from paternal origin?

Source:
Hassold,T. ,Chiu,D.Human Genetics.1985;70(1) :
11-17. )

• A)Eggs are arrested in meiosis in the mother from approximately birth until ovulation.
• B)Sperm travel to the site of fertilization,and an extra chromosome may slow them down.
• C)Eggs move little from their site of release to the site of fertilization.
• D)All of the above are possible explanations for the higher incidence of trisomy of maternal origin.

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