An acrocentric chromosome.    From Wordnet, Princeton University. 

If the centromere is close to the end, the chromosome is acrocentric and the very short arm consists of a stalk and a knob.    From Wordnik.com.  [Conservapedia - Recent changes [en]] Reference

The petitioner had said that he drew and labelled the parts of acrocentric chromosome as required in question number 19 in Section B of the biology question paper.    From Wordnik.com.  [The Hindu - Front Page] Reference

Agreeing with his submissions, the Division Bench said that the question, 'Draw and label the parts of acrocentric chromosome,' does not mention that the diagram should be depicted only in a particular position.    From Wordnik.com.  [The Hindu - Front Page] Reference

Examinations to award three more marks to a Plus Two student who was denied those marks in the public examinations held in March this year for having drawn a diagram of 'acrocentric chromosome' in a different position than the way it was printed in the biology textbook.    From Wordnik.com.  [The Hindu - Front Page] Reference

Dismissing a writ appeal filed by the State, a Division Bench comprising Justice D. Murugesan and Justice M. Duraiswamy agreed with the student's counsel, Isaac Mohanlal, that the acrocentric chromosome of the nucleus of living cells does not have a static position and hence it could be drawn vertically upward or vertically downward or even horizontally.    From Wordnik.com.  [The Hindu - Front Page] Reference