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Are genetic traits predictable?
The genetic basis of evolution may be predictable to some extent, and further understanding of this predictability requires incorporation of the specific functions and characteristics of genes into evolutionary theory.
How is a genetic trait inherited?
Inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment.
Is genetic drift predictable?
Random evolution in frequency of allelic states is called genetic drift. This kind of evolution is not predictable; it is random or stochastic. Stochastic evolution occurs in any finite population, whether or not selection is operating – no evolution is completely deterministic.
How genetic traits are determined?
Traits are determined by genes, and also they are determined by the interaction with the environment with genes. And remember that genes are the messages in our DNA that define individual characteristics. So the trait is the manifestation of the product of a gene that is coded for by the DNA.
Which of the following is inherited trait?
An inherited trait is a trait that is received by an organism from its parents. These traits are controlled by the genes of individuals and hence, transferred from one generation to another. Examples of inherited traits include hair color, eye color, height, skin color, and susceptibility to certain diseases, etc.
Which is not an inherited trait?
Disputes. Acquired characteristics, by definition, are characteristics that are gained by an organism after birth as a result of external influences or the organism’s own activities which change its structure or function and cannot be inherited.
Does genetic drift changes allele frequencies?
The consequences of genetic drift are numerous. It leads to random changes in allele frequencies. Drift causes fixation of alleles through the loss of alleles or genotypes. Drift can lead to the fixation or loss of entire genotypes in clonal (asexual) organisms.
Can a population evolve without heterozygotes?
(no selection). This is why genetic drift can be an important force in evolution. At the start of this drift process in our array of populations, p = 0.5 and there are 2pq = 0.5 = 50% heterozygotes. When all populations in the array have fixed or lost the allele, there can be no heterozygotes (i.e., 0%).
What determines the inheritance and appearance of traits?
The inheritance of each trait is determined by ‘factors’ (now known as genes) that are passed onto descendants. Individuals inherit one ‘factor’ from each parent for each trait. A trait may not show up in an individual but can still be passed onto the next generation.