Examlex
It is difficult to develop a universal flu vaccine because _________.
Dominant Alleles
Alleles that express their phenotype even when paired with a different allele in a heterozygous genotype.
Recessive Alleles
Genetic variants that must be inherited from both parents to be expressed in the offspring; not expressed when a dominant allele is present.
Genetic Drift
Genetic drift refers to random fluctuations in the frequencies of alleles (variant forms of a gene) within a population, which can lead to the increase or decrease in certain traits over time.
Natural Selection
The process in which organisms better adapted to their environment tend to survive and produce more offspring, leading to the gradual evolution of species.
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