Question

DNA and protein studies reveal that: a) variation among individuals and populations is ubiquitous b) Variation is widespread among species but not populations c) variation is widespread among populations but not species d) variation is lower than what was previously thought?

1) variation among individuals and populations is ubiquitous
2) Variation is widespread among species but not populations
3) variation is widespread among populations but not species
4) variation is lower than what was previously thought

Answer 1

Variation among individuals and populations is ubiquitous, and this genetic and phenotypic diversity is essential for natural selection and adaptive evolution, making it a cornerstone of biological variation within species.

Step-by-step explanation:

DNA and protein studies show that variation among individuals and populations is widespread. Such variation is the foundation of evolution, as it provides the raw material for natural selection. Variability in DNA sequence leads to different phenotypes among a population's individuals, which is essential for a population's adaptability and evolution over time.

For example, polymorphisms, which refer to variations in phenotype within individuals of a population or population variation, are common and can arise from factors like mutations, nonrandom mating, and environmental pressures. These variations, whether in fur color, plant traits, or body size adaptations, contribute to the diversity of life forms and are necessary for the processes of natural selection and adaptive evolution.