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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 rate; the manner in which the egg is fertilized, which is similar in very primitive animals and in man; fertilization and cell division, and development through several weeks of the fetus in man. The program covers the relationship between hybridization and sexuality and between sexuality and the continuity of a species, stressing that sex is the factor responsible for the extraordinary diversity among the members of a species. (25 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)
 
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)
 
Reproduction and the Environment

Though the act of sex and the process of fertilization are but moments in a lifetime, all of the other factors that determine and regulate life appear to improve the likelihood of successful reproduction. Species adapt or disappear, and variations in...(more details)
 
One Plus One Equals One

Sometimes as individuals and sometimes in swarms that may run to millions; sometimes the male moves in relation to the female organ and sometimes she in relation to his; sometimes on the ground, at other times underwater or in mid-air... The goal of ...(more details)
 


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