Submitted on: 18 December 1998.
Revised on: 31 January 1999.
Accepted on: 19 February 1999.
___________________JOURNAL OF HEREDITY---OXFORD UNIV PRESS INC
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Submitted on: 27 December 2000.
Revised on: 15 March 2001.
Accepted on: 06 May 2001.
___________________JOURNAL OF HEREDITY---OXFORD UNIV PRESS INC