Bacteria that become resistant to antibiotics by mutation or by acquiring resistance factors from other bacteria selectively survive in the presence of antibiotics. This is an example of natural selection.

Which of the following represents the proportion of individuals within a population that have heterozygous genotype?

Incomplete dominance describes an allele combination in which the heterozygous phenotype is intermediate between those of the two homozygotes (for example, pink flowers are intermediate between red flowers and white flowers). The dominant allele does not completely mask the recessive allele.

The term that is used to describe the severity or extent of a phenotype in an individual is called expressivity

Farmers have cultivated numerous popular crops, as shown in the figure, from the wild mustard, by_______________for certain attributes.

A geneticist crosses a plant with red flowers to a plant with white flowers. The offspring include plants with red flowers (1/4), pink flowers (1/2), and white flowers (1/4). Which allele is dominant?

Population databases are necessary to interpret DNA fingerprints because alleles occur with different frequencies in different populations.

A bell curve describes the distribution of phenotypic classes of a polygenic trait.

Which of the following proteins affects body weight?

Class 2 MHC  proteins  display internally derived proteins and are found on all cells.