Arrange the following steps in the correct chronological sequence to illustrate how modern evolutionary theory (Neo-Darwinism) explains a change in allele frequency within a population.
- 1A random genetic mutation occurs in germline DNA, producing a novel allele.
- 2The new allele expresses a phenotypic trait that confers a selective advantage in the environment.
- 3Organisms possessing the advantageous trait experience greater survival and differential reproductive success.
- 4The frequency of the beneficial allele increases in the population's gene pool over successive generations.
Cevap
The correct chronological sequence begins with a random germline mutation introducing a new allele, followed by phenotypic expression of a beneficial trait, differential reproductive success of favored individuals, and finally an increase in allele frequency in the population's gene pool.
Modern evolutionary theory specifies that random gene mutations generate novel alleles, which express phenotypic traits. Environmental selective pressures favor individuals bearing advantageous phenotypes, leading to higher reproductive success. Consequently, the frequency of those advantageous alleles increases in the population's gene pool over time.
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Anahtar Kavram
Neo-Darwinian Mechanism of Evolution