Rebecca went to a genetic counselor. When she had testing done she found that she was a carrier for the disease Tay Sachs. She showed no signs of the disorder, but she could pass the trait on to her offspring. Which of the following would correctly represent Rebecca’s genotype?

In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r). A homozygous dominant guinea pig and a homozygous recessive guinea pig are mated. Which of the following shows the possible genotypes of their offspring?

In Snapdragons, petal color is inherited through incomplete dominance with the possible colors being red, white, and pink. What would be the chance of getting a white flower if you cross a red flower with a pink flower?

In Camellia flowers, petal color is inherited codominantly with the possible colors being red, white, and red and white spots. What would be the chance of getting a white flower if you cross a spotted flower with a spotted flower?

The chart shows a dihybrid cross between pea plants. What are the genotypes of the parents in this cross?

A biologist is studying an environment that contains many different types of finches. What is one method that the biologist could use to determine how closely the different types of finches are related?

An analysis of DNA and RNA sequences can be used to classify organisms. A dendrogram, such as the one shown below, is based on molecular data and can be used to represent evolutionary relationships within a group of organisms that may have descended from a common ancestor. Which statement is best supported by the information in this dendrogram?

The opossum, which is native to North America, and the kangaroo, which is native to Australia, are marsupials. The fact that both these mammals incubate their immature offspring in a pouch provides evidence that they :

Look at the phylogenetic tree provided. Which hypothetical organism is the most recent common ancestor for Organisms A and G?

To determine how closely related organisms are, scientists consider all of the following EXCEPT:

Scientists discovered fossils of different organisms in some layers of rock. Organism 5 was discovered in the uppermost layer. The scientists wanted to determine if Organism 5 was related to other organisms found in older layers of rock. They compared physical traits and DNA similarities from all the fossils. Some of their results are shown in the table.

Based on the table, which organism is most likely an ancestor of Organism 5?

Given the information in the table provided, the closest evolutionary relationship most likely exists between the

The adaptation that allows some of these animals to run fast would be an example of natural selection if it helps them :

Scientists have discovered organisms that thrive in hot water that is 90°C (194°F) and do not need sunlight or oxygen to live. Into which kingdom would the scientists classify these organisms?

In which of the following taxonomic groups would organisms have the least number of similarities?

Use the following information to answer the question that follows.

Kingdom - Animalia

Phylum - Chordata

Class - Reptilia

Order - Testudines

Family - Emydidae

Genus - Terrapene

Species - Carolina

What is the correct scientific name for the organism classified above?

According to the chart, which of these pairs of organisms are the most closely related?

Using the dichotomous key provided, identify Bird 3:

In the cladogram below, which characteristic belongs in the spot labeled F?

Viruses use host cells to:

Which structure does a virus have in common with a prokaryotic cell?

Which of the following occurs during a viral lysogenic cycle?

Which characteristic would cause scientists to classify these organisms as protists, rather than bacteria?