Arrange the following biological events in the correct chronological sequence to illustrate how a beneficial trait spreads in a population according to modern evolutionary theory.
- 1A random mutation occurs in a gene, producing a novel allele.
- 2Organisms carrying the novel allele exhibit higher survival and reproductive success.
- 3The advantageous allele is transmitted to offspring at a higher frequency in subsequent generations.
- 4The overall allele frequency in the population's gene pool shifts over time.
Cevap
The correct evolutionary sequence begins with a spontaneous gene mutation introducing a new allele, followed by natural selection favoring individuals with the advantageous trait, leading to differential transmission of the allele to offspring, and culminating in a shift in the population's overall allele frequency.
The correct sequence starts with the generation of novel genetic variation via random mutation. Natural selection then acts on this variation by favoring organisms with the advantageous phenotype. These individuals reproduce more successfully, transmitting the allele to their progeny. Over generations, this differential reproduction alters the overall allele frequency of the population's gene pool.
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Anahtar Kavram
Sequential mechanism of microevolution through mutation and natural selection
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