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The Evolution of Sex Chromosomes in Papaya (Carica papaya)

Weingartner, Laura A.
http://rave.ohiolink.edu/etdc/view?acc_num=miami1280960954

Abstract Details

2010, Master of Science, Miami University, Botany.
The sex chromosomes of the tropical crop papaya (Carica papaya) are young and consequently allow for the examination of evolutionary forces that affect early sex chromosome formation. We sequenced four X/Y gene pairs from a collection of natural papaya populations and examined the data for molecular signatures of selection and other evolutionary forces that govern sex chromosome formation. In most sex chromosome systems, the Y chromosome displays significantly reduced polymorphism levels while the X chromosome maintains a level of polymorphism that is comparable to autosomal loci. However, the four papaya sex-linked loci that we examined display diversity patterns that are opposite to this trend. The X alleles exhibit significantly reduced polymorphism levels while the Y alleles maintain expected or greater than expected levels of diversity. We hypothesize that the X chromosome has recently undergone a selective sweep while elevated Y polymorphism is due to population structure.
Richard C. Moore, PhD (Advisor)
Chun Liang, PhD (Committee Member)
Martin Henry H. Stevens, PhD (Committee Member)
80 p.
Botany; Genetics
papaya; sex chromosome; molecular evolution; Y evolution; population genetics

Recommended Citations

Citations

  • Weingartner, L. A. (2010). The Evolution of Sex Chromosomes in Papaya (Carica papaya) [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1280960954

    APA Style (7th edition)

  • Weingartner, Laura. The Evolution of Sex Chromosomes in Papaya (Carica papaya). 2010. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1280960954.

    MLA Style (8th edition)

  • Weingartner, Laura. "The Evolution of Sex Chromosomes in Papaya (Carica papaya)." Master's thesis, Miami University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1280960954

    Chicago Manual of Style (17th edition)

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© 2010, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.