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The simplest definition of life is the capability to reproduce; but since crystals grow and multiply, this definition is insufficient. This program explains the differences between multiplication and reproduction, and traces the development of reproductive mechanisms from the unicellular being which splits in two to the evolutionary mechanisms which result in genetic change and which led to the development of more complicated life forms. Beginning with reproduction in amoebae, paramecia, various algae, and hydra, the program shows the advantages of the fertilizable egg, and demonstrates how variously in various species the message is sent from egg-bearer to sperm-bearer that the time is ripe for fertilization; also how the eggs are cared for, and the hatchlings. (28 minutes)



 
        

Item#: This title is currently not available.
Copyright date: ©1990



Part of the Series : Gender and Reproduction: A Natural History
     


Only available in the US, Canada, Australia/New Zealand, the United Kingdom, Ireland, Malta and South Africa.




Survival of the Fittest

Whether among fowl, frogs, crustaceans, insects, or elsewhere in the animal kingdom, aggressive behavior as a means of protecting territory and establishing sexual dominance doesn't always mean a fight to the death. This program gives clear examples ...(more details)
 
The Rituals of Courtship

To ogle or preen, to dance, to feel, to ask to dinner or flaunt one's power literally or symbolically, to cloak one's intentions or air them freely-man has no monopoly on this catalogue of seductive behavior. From what appears like the tender, consid...(more details)
 
Reproduction and Diversity

Sexual reproduction never produces the same result twice but rather ensures variation in the offspring of a species. This program follows the care and development of the egg-the relationship of the number laid, fertilized, and hatched to the survival...(more details)
 
The Regulation of Social Organization

This program looks at social organization in the animal kingdom and at the stark contrast between the fierceness that often precedes copulation and the gentleness accorded the resulting young. The social life of animals is strictly regulated-very dif...(more details)
 
The Chemistry of Fertilization

Sexual reproduction is not necessarily, or even most frequently, the result of a meeting between two individuals, but rather a chemical attraction between ovule and spermatozoon. Among many animals and all plants, fertilization takes place without aw...(more details)
 


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