lecture 5 exam 3

lecture 5 exam 3 - Biology 313 Lecture 27 Oct 29, 2010 Male...

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Unformatted text preview: Biology 313 Lecture 27 Oct 29, 2010 Male gametogenesis occurs in testes called spermatogenesis occurs continuously after puberty Gamete formation in humans occurs in ovaries called oogenesis all oogonia are produced pre-natally, start meiosis and become arrested in Pro I (called primary oocytes ) females are born with primary oocytes : the Pro I arrest can last 30-40 years Female gametogenesis at ovulation, 1-2 primary oocytes are induced to finish meiosis I and are ovulated from the ovary as secondary oocytes secondary oocytes undergo meiosis II when fertilized by sperm to form the ovum and the 2 nd polar body ; nuclei fusion of ovum and sperm gives rise to zygote Polyploidy Two major types of polyploidy:- Autopolyploidy all chromosome sets are from a single species- Allopolyploidy- chromosome sets are from two or more different species Most allopolyploids arise from crosses between two species. followed by chromosome doubling Allopolyploidization and cultivation of triticum aestivum (bread wheat) Allopolyploidization of...
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lecture 5 exam 3 - Biology 313 Lecture 27 Oct 29, 2010 Male...

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