Speciation160-page5

Speciation160-page5 - diploid gamete. If two diploid...

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Methods of Speciation - 5 Temporal isolation occurs if fertility occurs at different times. This can happen because of different hormonal signals, or because adults mature at different times of the year or even in different years. 17-Year Cicada Sage Flowers and Sage Buds of Different Species Genetic Isolation Immediate Genetic isolation results from polyploidy. In plants it is not unusual for a fertilized egg to have DNA replication but not complete meiosis, resulting in a
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Unformatted text preview: diploid gamete. If two diploid gametes fuse, tetraploids result that may be fertile. Such polyploidy is known as autopolyploidy. Polyploids may result between two closely related species if the first diploid gamete (species A) fuses with a gamete from species B and their fertile offspring also produce diploid gametes that fuse once more with one of the original species. Such polyploids are allopolyploids (allo = different). Autopolyploidy Allopolyploidy...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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