In the algebraic expression p2 + 2pq + q2 = 1, the q2 refers to:

Within a single cycle of PCR which statement is true?

Natural selection acts on ______, but the overall impact, evolution, is seen in changes to ______.

Which of these would prevent a population from being in equilibrium according to the Hardy-Weinberg conditions?

The diagram below represents the bones of the forelimbs of two animals alive today that most likely evolved from a common ancestor. Members of the original ancestral population were isolated into two groups by natural events. The top structure shows a forelimb with a single long bone on the left, followed by two parallel bones in the middle section, then a cluster of small bones, and ending with several elongated bone segments extending to the right. The bottom structure shows a similar arrangement with a single long bone on the left, two parallel bones in the middle section, a cluster of small bones, and bone segments at the end, but with a different overall shape and proportions. The top forelimb appears more horizontal and elongated, while the bottom forelimb has a more curved appearance with the bone segments angled downward. If these two animals did have a common ancestor, which statement would best explain why there are differences in the bones?

Tracing the evolutionary history of a species or group of species is called ______.

In the first level of DNA organization, eight histones come together to form a small spool, or bead, that winds a short segment of DNA. This spool, or bead, is called a ______.

DNA is ______ into RNA, which is ______ into protein.

” Five vertical columns display DNA band patterns using black, dark gray, and light gray horizontal bands at various positions. The first column, labeled Crime Scene, shows from top to bottom: a black band near the top, a black band with a thin white line through it in the upper section, a black band below that, a dark gray band in the middle, a light gray band, a light gray band, a dark gray band, a dark gray band, a black band, a dark gray band, and a black band at the bottom. The second column, labeled Suspect 1, shows: a black band in the upper section, a light gray band, a light gray band, two black bands close together in the middle, a light gray band, a black band, a black band, and a light gray band at the bottom. The third column, labeled Suspect 2, shows from top to bottom: a black band near the top, a black band with a thin white line through it in the upper section, a black band below that, a dark gray band in the middle, a light gray band, a light gray band, a dark gray band, a dark gray band, a black band, a dark gray band, and a black band at the bottom. The fourth column, labeled Suspect 3, shows: a black band in the upper section, a light gray band, two light gray bands in the middle, a black band, a light gray band, a dark gray band, a light gray band, a black band, and a black band at the bottom. The fifth column, labeled Suspect 4, shows: a light gray band near the top, a black band in the upper section, a light gray band, a light gray band, two black bands close together, a light gray band, three light gray bands, a black band, and a black band at the bottom.” The gel shows a DNA sample taken at a crime scene on the left along with DNA samples of three suspects. Which suspect is most likely to be the perpetrator?

Genes can be transcribed and translated even after being transplanted from one species to another. What basic fact makes this possible?