Blog

In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between. If the butterflies in a mountain population become more and more similar in color over several generations (e.g., if most butterflies are the same shade of gray), what kind of evolutionary force is likely acting on the population?

An object is thrown vertically upward from a height of y1= 10 m with an initial velocity of v0 ​ = 72 m/s. The position versus time graph is shown in the figure.  What is time t3? Express your answer in seconds (s).

Two species of garter snakes live in the same geographic area. One lives mainly in water and the other mainly on land; therefore, they rarely encounter each other and do not interbreed. What type of isolation is this?

You are given a group of organisms that includes a: Colorado Blue Spruce tree, Desert Spadefoot Toad Brook Trout Red-Tailed Hawk Black Bear Draw a phylogenetic tree on your paper that reflects evolutionary relationships. Label each “branching event” (both sides) with the shared characteristic that was used to make your decisions.  Upload a photo of your tree.

A young male baboon leaves the troop that he was born in and joins a small neighboring troop of small baboons. He quickly rises to become a dominant male. From an evolutionary point of view, what important process has occurred? 

How does the founder effect influence the frequency of alleles in a population?

If the weather in Virginia changed so dramatically that there was snow on the ground most of the year, what would occur in the local squirrel population?

 The X-linked varieties of congenital stationary night blindness (CSNB) causes myopia (near sightedness), impaired night vision, reduced visual acuity, and other symptoms. A normal man (whose father has CSNB) marries a normal woman (whose father also has CSNB). If you were only looking at male offspring, what is the chance that a SON will have CSNB? (For the purposes of this question, if there are 2 of the same allele letter, place alleles with a linked trait second.) [chance] chance that a SON will have CSNB. [dad1] [dad2] [mom1] [FA] [FB] [mom2] [FC] [FD]

Dandelions in a lawn that is mowed have short flower stalks, whereas those in a field have tall flower stocks. This illustrates:

DNA replication is controlled by enzymes. 1)____________“unzips” the double helix by breaking hydrogen bonds, 2)___________ adds new nitrogenous bases to the exposed single strands, and 3) ____________ bonds short sequences together that are formed from the lagging strand (the strand that is “read” in the opposite direction).