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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 awareness—the meeting of cells, not of individuals, is at the heart of sexual reproduction. The program covers fertilization among plants—accomplished by the wind or by insects, birds, or snails; explains the chemistry of reproduction in starfish; and shows how choice of sexual partner among animals ranging from the battle between contending male deer to the decapitation of her mate by the praying mantis is related to chemical messages from egg and sperm. (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)
 
Reproduction and Gender

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 reprod...(more details)
 
Mating Signals

Vibrations and songs, emissions of light, chemical signals and sexual odors-each species has its own method of signalling the other sex that the time is ripe for procreation. Depending on the social behavior of a species, males and females may have a...(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)
 
Recognizing Gender Differences

According to species, the sexes are recognizable to one another by shape, size, behavior, sound, odor. The program covers a range of animal behaviors, from gift-giving to aggression to what in humans would be called caressing-what should we call it i...(more details)
 


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