Unit Test Answers

In a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds?Key: R = round r = wrinkled Y = yellow y = green

Which was most likely an effect on society that resulted from improvements in blood handling during World War I and World War II?

In peas, yellow seed color (Y) is dominant to green seed color (y). Which describes an organism that has nonidentical alleles for seed color?

Which of Mendel’s generations was allowed to self-pollinate?

The use of DDT as a pesticide is an example of how new technology can have favorable and dangerous long-term outcomes. How does this relate to the use of DNA technology?

The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below. Which of Thomas Hunt Morgan's hypotheses was valid based on these results?

Gregor Mendel used pea plants that were heterozygous for each of two traits—seed color and seed shape—to generate a dihybrid cross. The phenotypic ratio of the resulting offspring was nine with round and yellow seeds, three with round and green seeds, three with wrinkled and yellow seeds, and one with wrinkled and green seeds. From these results, what could Mendel conclude?

Which allele combination represents a male who has an X-linked recessive disorder?

Which statement best explains why the process of genetic engineering is important to the scientific community?

Mary has type A blood. Her son Bill has type AB blood. Which blood type does Bill's dad have if he is homogenous for blood type?

Which DNA fingerprinting technique examines the length variation of DNA repeat sequences in human DNA?

A student is given a list of traits and is asked to organize them in a Venn diagram as shown below. Which traits should the student put in section I (Inherited)?

A pea plant exhibits a recessive trait. Which statement is most likely true about the plant?

Scientists have genetically engineered potato plants to produce potatoes that contain edible vaccines. Which is a disadvantage of the genetically engineered potatoes?

Parkinson’s disease is a brain disorder that may be caused by mutations in several genes that code for the production of alpha-synuclein. Individuals who have Parkinson’s disease exhibit symptoms such as uncontrollable tremors, difficulty walking, and loss of coordination. How might geneticists determine where the mutations that cause Parkinson’s disease are located?

A purebred plant that has yellow flowers is crossed with a purebred plant that has white flowers. All the offspring have yellow flowers. Which conclusion about yellow flowers is supported by these results?

Which is an external environmental factor that affects heredity?

Scientists have recently modified the bacteria that cause tooth decay by inserting a fragment of DNA into the bacteria's DNA that prevents it from producing lactic acid. What is this process called?

Which Punnett square represents a cross between two parents that are heterozygous for purple flowers?

If a person has type B blood, which statement describes the antibodies present in his or her blood?

A scientist is studying fruit fly wings. Straight wings are dominant, and curly wings are recessive. Which statement correctly describes the F1 generation if a straight-winged parent is crossed with a curly-winged parent and if both parents are true breeding?

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. What is the probability of having offspring that have wrinkled seeds and yellow seed color for the cross RRYY ´ RrYy?

In peas, yellow seed color (Y) is dominant to green seed color (y). A homozygous green seed pea plant is crossed with a heterozygous yellow seed pea plant. What is the predicted phenotypic ratio of the offspring based on seed color?

Which is a potential negative consequence of using genetically engineered medicine?

The process of genetic engineering may include either four or five steps. The diagram represents the five-step process.Which best describes step 2?