Natural selection changes allele frequencies because some _________ survive and reproduce better than others.a. allelesb. locic. speciesd. individuals

Which type of selection maintains stable frequencies of two or more phenotypic forms in a population?

Selection that acts over evolutionary time to preserve traits that increase an individual's ability to mate is known as __________.

Which statement below is true about sexual selection?

A number of mosquito populations today are resistant to insecticides that were once quite effective. Biologists think that insecticide resistance evolved in mosquitoes because __________.

The largest unit within which gene flow can readily occur is aa. population.b. species.c. genus.d. hybrid.

How do the phospholipids in archaea differ from those in other cells?a. They have tails made of unsaturated fatty acids instead of saturated fatty acids.b. They do not contain hydrocarbon chains.c. They have isoprenoid tails instead of fatty acid tails.d. They have two hydrocarbon chains instead of three hydrocarbon chains.

What two functional groups are bound to the central carbon of every free amino acid monomer?a. an R-group and a hydroxyl groupb. an N—H group and a ═(C═O) groupc. an amino group and a hydroxyl groupd. an amino group and a carboxyl group

No two people are genetically identical, except for identical twins. The main source of genetic variation among humans isa. new mutations that occurred in the preceding generation.b. genetic drift.c. the reshuffling of alleles in sexual reproduction.d. environmental effects.