Test — Cumulative exam Answers

Carlos made a study chart about changes to the environment that are caused by humans. Environmental Changes Caused by HumansXYResults from introducing harmful substances into the environmentCauses an increase in ultraviolet radiation that reaches Earth Results from the rising human populationCauses the disappearance of many species in a short amount of time

Which of the following could be a nucleotide of DNA?

A fossil of a new primate species is discovered. Scientists find evidence that members of this species traveled long distances without putting their hands down on the ground and used tools. Which trait would the fossil most likely have?

An anthropologist finds a fossil that is 2 million years old, and it had simple tools nearby. To which species could the specimen belong?

If a scientist wanted to follow Mendel’s experiment with a different kind of plant, which type of plant would she examine?

Sophie says dolphins and sharks look very similar, so they must be related. Jake disagrees, saying DNA evidence has shown that dolphins and other aquatic mammals are actually more closely related to the ancestors of modern hippos. Who is correct using the modern system of classification?

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. There has been much debate about the classification of these creatures. Some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. The data equally support both cases.Which statement best explains how to draw a cladogram that includes the rynchosaur?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A parakeet that is heterozygous for blue feathers (dominant) is crossed with a parakeet that is homozygous for white feathers (recessive). According to the Punnett square for this cross, what percentage of offspring is predicted to have blue feathers?

Which statement best describes how Watson and Crick's model used other scientists' work to create a model of DNA?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp). Which genotypes will be included for the offspring in the Punnett square for this cross?

Which of the following is an example of adaptive radiation?

Kudzu is a vine that was brought to the United States from Japan to prevent erosion. Once here, kudzu became invasive. What role does kudzu most likely play in the environment in the United States?

When comparing dogs to wolves, scientists found evidence that supports the idea they come from a common ancestor. Which combination of evidence would most strongly support this idea?

Hyenas and lions have fierce battles over food. Which type of relationship does this describe?

The lava released by a volcanic eruption separates two populations of a species of monkey. What does this represent?

Fossils show how the complexity of living organisms has changed over time. Gerobatrachus hottoni was a unique organism that lived during the Permian period between ancient salamanders and ancient frogs. Scientists have nicknamed this organism the “frogamander” because it is believed to be a common ancestor of both modern frogs and salamanders.Which type of fossil is Gerobatrachus hottoni most likely to be?