: 1 E3 21 5.8 Evolution Discussion Board (Graded Assignment) Alberto Vigil 15 15
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: 1 E3 21 5.8 Evolution Discussion Board (Graded Assignment) Alberto Vigil 15 15 In simplest terms, evolution can be defined as a change in allele frequency over time. A fact of nature is that allele frequencies for any given gene are always in a state of flux and for that reason evolution is a fact of nature. At the same time we have theories that help us explain why allele frequencies change in the first place. We call these evolutionary theories and for this section we explored two of these theories..natural selection and genetic drift. The purpose of this discussion board is meant for you to share any ideas or to demystify any difficulties that you may have about evolutionary theory. Feel free to share your thoughts in an open ended but informed way! For your contribution you will receive participation points.Explanation / Answer
1.life span
The extreme variation in life spans between similar species was immediately noted as a conflict following publication of Origin.
2.Negligible Senescence
A few organisms have been observed that apparently do not age. They do not display deterioration in their survival traits (such as strength, mobility, or sensory capability) or any lessening of their reproductive capability with age.
3.Biological Suicide
Various plants and animals were observed to die suddenly following reproduction. Semelparous organisms die following their first reproduction and include a mammal, the male marsupial mouse, which dies following mating.
4.Delayed Sexual Maturity
Many animals, especially males, have sexual maturity that occurs at a late age relative to what appears to be biologically necessary from a functional, growth or development perspective, a reproductive disadvantage.
5.Inheritance Mechanism Issues
Inheritance mechanisms are critical to any evolutionary mechanics theory because mutational changes occur in a single individual and then propagate into a population by means of biological inheritance. Darwin knew virtually nothing about the mechanics of inheritance. It was reasonable for him to assume that all mutations were equally likely, that the inheritance mechanisms of all species treated all mutations equally, and that therefore natural selection was the only process that differentially affected the propagation of mutations. Mutations occurred. Natural selection differentially affected their propagation.
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