The Monk and his pea1

The Monk and his pea1 - from anther to stigma) occurs prior...

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The Monk and his peas An Austrian monk, Gregor Mendel, developed the fundamental principles that would become the modern science of genetics . Mendel demonstrated that heritable properties are parceled out in discrete units, independently inherited. These eventually were termed genes . Mendel reasoned an organism for genetic experiments should have: 1. a number of different traits that can be studied 2. plant should be self-fertilizing and have a flower structure that limits accidental contact 3. offspring of self-fertilized plants should be fully fertile. Mendel's experimental organism was a common garden pea ( Pisum sativum ), which has a flower that lends itself to self-pollination. The male parts of the flower are termed the anthers . They produce pollen , which contains the male gametes (sperm). The female parts of the flower are the stigma , style , and ovary . The egg (female gamete) is produced in the ovary. The process of pollination (the transfer of pollen
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Unformatted text preview: from anther to stigma) occurs prior to the opening of the pea flower. The pollen grain grows a pollen tube which allows the sperm to travel through the stigma and style, eventually reaching the ovary. The ripened ovary wall becomes the fruit (in this case the pea pod). Most flowers allow cross-pollination, which can be difficult to deal with in genetic studies if the male parent plant is not known. Since pea plants are self-pollinators, the genetics of the parent can be more easily understood. Peas are also self-compatible, allowing self-fertilized embryos to develop as readily as out-fertilized embryos. Mendel tested all 34 varieties of peas available to him through seed dealers. The garden peas were planted and studied for eight years. Each character studied had two distinct forms, such as tall or short plant height, or smooth or wrinkled seeds. Mendel's experiments used some 28,000 pea plants....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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The Monk and his pea1 - from anther to stigma) occurs prior...

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