Lecture XIV - Life history

Lecture XIV - Life history - Lecture XIV Life History...

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Lecture XIV – Life History
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Reproduction As mentioned in the Evolution section, Reproduction may occur in two ways: Asexual Sexual
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Asexual Reproduction Reproduction occurring only through mitotic cell division. Occurs in animals (like hydra), plants (bananas), all single-celled organisms. http://www.ccs.k12.in.us/chsBS/kons/kons/images/asexual.jpg http://www.microscope-microscope.org/gallery/Mark-Simmons/images/hydra2.jpg
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Sexual Reproduction Reproduction through merging of haploid cells created by meiosis. Accompanied by the existence of multiple genders However, an individual may not always be assigned a single gender. http://cache.eb.com/eb/image?id=5612&rendTypeId=4
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Hermaphrodites In many animal species, individuals may posses the ability to participate in reproduction as both male and female. This may occur sequentially (some fish, some molluscs, etc.) – animals change gender over their life This also may occur concurrently: animals may have both male and female reproduction organs http://content.answers.com/main/content/wp/en-commons/thumb/2/25/240px-Blue-headed_wrasse_det.jpg http://www.wildlifeextra.com/images/Aplysia-fasciata.JPG
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Plants In plant, the situation is more complex. Plants may be: Dioecious – separate male and female individuals Monoecious – separate male and female organs (in flowers) on the same plant Bisexual Monoecious – male and female organs in every flower http://www.parasiticplants.siu.edu/Balanophoraceae/images/Bal.laxiflora2.JPEG http://plantandsoil.unl.edu/croptechnology2005/UserFiles/Image/siteImages/Male-Female-Corn-SC-LG.gif http://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Mature_flower_diagram.svg/400px-Mature_flower_diagram.svg.png
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Life Histories and Cycles Species have distinctive" life cycles Each species also has a “life history ,” Adaptation produces consistent differences in life history of species or higher groups adapted to different environments, e.g., r- and K- selected species (more later)
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Life Histories and Cycles Life cycles: The distinctive life cycle of a species is the sequence of stages through which it passes from
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This note was uploaded on 01/23/2010 for the course BIOS 230 taught by Professor Gibbons during the Fall '08 term at Ill. Chicago.

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Lecture XIV - Life history - Lecture XIV Life History...

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