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Chapter 17 (Sexual Reproduction (Without sexual reproduction, a gene pool…
Chapter 17
Sexual Reproduction
Without sexual reproduction, a gene pool would be almost non-existent.
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Sexual reproduction requires a gene pool, though, as many examples of incest and their consequences are available from the interbreeding of royal families across the globe.
Sexual reproduction results in a 50% share of genes between the two parents, resulting in offspring that will carry possible desirable traits.
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Another good benefit of sexual reproduction is that not all eggs are put into one basket, so to speak.
If all humans had a susceptibility to the common flu that led to a 100% mortality rate, extinction would be inevitable.
Thankfully sexual reproduction wouldn't allow this - while some would be vulnerable, others would not be vulnerable, and survive.
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Gene pools are important due to the fact that genetic diversity can give the best traits to all of a species.
Gene pools are a little like drawing straws - some traits are better than others, but the diversity is good for reproduction.
Incest is the result of a complete lack of a gene pool, and this typically results in deformation or disability.
The gene pool in humans is easy to see - people have red hair, blonde, brunette, dark skin, light skin, etc.
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Phyletic speciation
This form goes as follows; Species 1 evolves into species 2 further down the line, which evolves into species 3..
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While population split ups are common, it is more rare for a population to become so differentiated from the original group to be considered another species.
While the different species may appear similar, the species have evolved differently - even though it may be hard to see.
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Convergent evolution
For example, many sharks are different species, but many if not all carnivorous sharks have sharp teeth with which to kill prey.
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