In a hypothetical population of tree swallows, 18 individuals are homozygous for the c4 allele, 22 individuals are heterozygous for the allele, and 10 individuals lack the allele. What is the frequency of the c4 allele?

Which characteristic of life is demonstrated when single-celled organisms split in half, resulting in twice as many organisms as before? A) acquiring energy B) reproducing C) maintaining structure D) hardiness

For most of human history, salt was a rare and valuable commodity that had to be either mined or extracted from the ocean through evaporation. This changed when modern chemistry allowed humans to produce it in factories.

A client is admitted to the hospital with the diagnosis of a right-sided brain attack (stroke). the client is right-handed. which task will be most difficult for this client?

4.) The DNA sequence above is found on a chromosome in a eukaryotic cell. The cell is allowed to undergo DNA replication and mitosis in a solution containing radio-label free nucleotides.

Evidence for evolution by natural selection that was a part of darwinís thinking in developing his theory includes:

What is one of the most important factors in determining whether a chemical reaction will occur?

What is a alleles in biology?

Sex-linked traits are found on which chromosome?

Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to

What effect on the evolution of mammals was caused when the continents drifted apart?