Genes can acquire mutations in their sequence, leading to different variants, known as alleles, in the population. These alleles encode slightly different versions of a protein, which cause different phenotype traits. Colloquial usage of the term "having a gene" (e.g., "good genes," "hair colour gene") typically refers to having a different allele of the gene. Genes evolve due to natural selection or survival of the fittest of the alleles.
What causes genes to evolve?
natural selection or survival of the fittest of the alleles

Some nouns have two different diminutives, each with a different meaning: bloem (flower) bloempje (lit. "small flower"), but bloemetje (lit. also "small flower", meaning bouquet). A few nouns exist solely in a diminutive form, e.g. zeepaardje (seahorse), while many, e.g. meisje (girl), originally a diminutive of meid (maid), have acquired a meaning independent of their non-diminutive forms. A diminutive can sometimes be added to an uncountable noun to refer to a single portion: ijs (ice, ice cream) ijsje (ice cream treat, cone of ice cream), bier (beer) biertje. Some diminutive forms only exist in plural, e.g. kleertjes (clothing).
What's the Dutch word for "seahorse" that has no non-diminutive form?
zeepaardje

The area's many colleges and universities are active in college athletics. Four NCAA Division I members play in the cityBoston College, Boston University, Harvard University, and Northeastern University. Of the four, only Boston College participates in college football at the highest level, the Football Bowl Subdivision. Harvard participates in the second-highest level, the Football Championship Subdivision.
Which college participates in college football at the highest level?
Boston College