Natural selection acts on the phenotype (the traits or characteristics) of an individual. On the other hand, natural selection does not act on the underlying genotype (the genetic makeup) of an individual. For many traits, the homozygous genotype, AA, for example, has the same phenotype as the heterozygous Aa genotype.
Does natural selection act upon the genotype or phenotype?
Natural selection acts on an organism’s phenotype, or physical characteristics. Phenotype is determined by an organism’s genetic make-up (genotype) and the environment in which the organism lives.
What would happen if natural selection acted on the genotype?
While it may make sense that natural selection would act on the genotype, an organism’s genetic make-up, the action actually occurs on the phenotype, an organism’s physical traits. Having a secret genetic ability to produce blue-eyed offspring doesn’t matter one bit to your potential mate.
How does natural selection affects genotypes by acting on phenotypes?
How does natural selection affect genotypes by acting on phenotypes? Phenotypes can benefit an organism and increase its survival in its environment. Indirectly, since genotypes determine phenotypes, natural selection can wipe out individuals carrying certain genotypes.
Does natural selection affect genotype frequencies?
Natural selection also affects allele frequency. If an allele confers a phenotype that enables an individual to better survive or have more offspring, the frequency of that allele will increase.
Does natural selection work on phenotype or genotype give an example that supports this claim?
As in the butterfly example, natural selection occurs when an organism’s physical characteristics make it either more or less suited to thrive in an environment. The physical characteristics are called the phenotype; therefore, natural selection works directly on phenotype.
Does natural selection act on alleles?
Natural selection does not act on individual alleles, however, but on entire organisms. … Natural selection acts at the level of the individual; it selects for individuals with greater contributions to the gene pool of the next generation, known as an organism’s evolutionary (Darwinian) fitness.
What does natural selection directly act on?
Natural selection acts on an organism’s phenotype, or observable features. Phenotype is often largely a product of genotype (the alleles, or gene versions, the organism carries).
Is natural selection the only means of evolution explain?
Much change is due to random genetic drift rather than positive selection. Some are harmful and are likely to be eliminated by natural selection – by death of the embryo, for instance. …
Does natural selection act on individuals or populations?
Natural selection acts on populations. Individuals do not evolve in genetic evolutionary terms. Individuals may mutate, but natural selection acts by shifting the characteristics of the population as a whole.