At the bottom is node 1. From node 1, two lines extend upward, one leading to node 2 on the left and one leading to node 3 on the right. From node 2, two lines extend upward, one leading to node 4 on the left and one leading to node 5 on the right. From node 3, two lines extend upward, one leading to node 6 on the left and one leading to node 7 on the right. From node 4, two lines extend upward to taxa A on the left and B on the right. From node 5, two lines extend upward to taxa C on the left and D on the right. From node 6, two lines extend upward to taxa E on the left and F on the right. From node 7, two lines extend upward to taxa G on the left and H on the right. Which evolution ancestor on this cladogram is the most recent in evolutionary time?

Following mass extinction events

A cladogram could be created to illustrate all of these except

Regulation of gene expression occurs first at the DNA structural level, and is even more tightly regulated at the transcription level, but even after a gene has been transcribed there are mechanisms at work to regulate expression.  ” At the top, a long horizontal pink DNA strand contains five colored exons interspersed throughout its length. From left to right, the exons are: a teal section labeled Exon 1, a purple section labeled Exon 2, a brown section labeled Exon 3, a yellow section labeled Exon 4, and a blue section labeled Exon 5, with long pink sections of DNA between each exon. Below this are three different splicing variants. The left variant shows a horizontal strand with sections labeled Exon 1, Exon 2, Exon 3, Exon 4, and Exon 5 in teal, purple, brown, yellow, and blue respectively. Below this strand are protein structures shown as folded ribbons. The teal structure consists of a coiled region forming a compact shape. The purple structure is a coiled region forming a loop-like shape. The orange-brown structure forms a larger loop. The yellow structure forms an elongated loop shape. The blue structure is a small coiled region. These same colored structures with identical shapes appear in the other two variants below. The middle variant shows a horizontal strand with sections labeled Exon 1, Exon 2, Exon 4, and Exon 5 in teal, purple, yellow, and blue respectively, with Exon 3 omitted. Below this strand are the corresponding protein structures in teal, purple, yellow, and blue. The right variant shows a horizontal strand with sections labeled Exon 1, Exon 2, Exon 3, and Exon 5 in teal, purple, brown, and blue respectively, with Exon 4 omitted. Below this strand are the corresponding protein structures in teal, purple, orange-brown, and blue.” This image best illustrates ______.

 Two curves are displayed. A dashed black line represents the Original population, forming a single bell-shaped curve in the center. A solid pink line with pink shading underneath represents the Population after selection, forming two distinct peaks on the left and right sides of the original peak with a valley between them. This graph depicts _______ selection.

True or false? Animal behaviors and their evolution can be represented on a phylogenetic tree.

“Any technique that seeks to manually add DNA to an organism, with the goal of making that organism display traits it would not normally display.” This best defines ______.

Which of these is not a question ecologists seek to answer?

Habitat isolation is a reproductive barrier that refers to

The study of the changes in the genetic makeup of a population from one generation to the next, or over the course of only a few generations, is called _______.