Biology B- 1

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

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

Which statement best describes an understanding of genetics that would be missing without the work of Mendel?

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

Mendel's pea plants had either purple or white flowers. This means that the plants

A scientist wants to examine a genetic disease in humans. The scientist hypothesizes that the disease can be treated by using gene therapy. Humans take a long time to reproduce and develop, so the scientist will have to

In the F1 generation of a Mendelian cross,

What number should replace the letter x in the "Seed color" row?

If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?

What is a gene?

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Purple flowers are dominant over white flowers. A heterozygous purple flower is crossed with another heterozygous purple flower. The ratio of purple to white would be

Which describes the mating of organisms that have different homozygous alleles for a single trait?

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?

Gregor Mendel crossed homozygous tall plants (TT) with homozygous short plants (tt). All the resulting offspring were tall. From these results, what conclusion did Mendel draw?

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). mc022-1.jpg mc022-2.jpg According to the Punnett square for this cross, what percentage of offspring is predicted to have blue feathers?

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?

The image shows a white sweet pea that is labeled with its two alleles for petal color. mc020-1.jpg What can you surmise from the labeled image?

The image shows a purple sweet pea that is labeled with its two alleles for petal color. mc021-1.jpg Which is the genotype of the sweet pea?

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). mc011-1.jpg mc011-2.jpg Which genotypes will be included for the offspring in the Punnett square for this cross?

The offspring of a particular cross are 100 percent heterozygous for tallness. What were the most likely genotypes of the parents?

Which of Mendel's laws or principles explains that traits are passed from parents to offspring individually instead of as pairs, groups, or sets?

What can be known about Mendel's five-part hypothesis?

Which are different forms of the same gene?

Which type of scientific statement is defined as "a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable"?

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

Which type of scientific statement is defined as a hypothesis or group of hypotheses that can be accepted as true based on repeated experimentation with similar results?

Parents that are heterozygous for having freckles (dominant) are crossed. Which represents the ratio of their offspring?

Which conclusion about the meaning of Y is correct if the allele combination Yy is for yellow seeds?

When plants that are heterozygous for round seeds are crossed, what is the probability that the offspring will have wrinkled seeds?

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?

Skin color, fur color, and height are examples of which inheritance pattern?

The graph demonstrates the quantitative variation for skin pigmentation. mc011-1.jpg Which conclusion is supported by the graph?

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?

If a red cow (homozygous dominant) is crossed with a white cow (homozygous dominant), what alleles will the offspring have?

Suzanne has type A- blood. Which blood type could she receive in a blood transfusion?

A purebred purple flowering plant is crossed with a purebred white flowering plant, and they produce offspring that have purple flowers. Which is the trait for purple flowers?

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

Which statement best describes human eye color?

John and Pat are identical twins with identical DNA. John works in a movie theater, and Pat works as a lifeguard. They have very different skin pigmentation. Which is the best explanation of the difference?

How are sex-linked traits inherited?

Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?

Red-green color blindness is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree.

Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

Which is not considered a sex-linked trait?

Which symbol is used to label a male that expresses a sex-linked disorder on a pedigree?

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows the probability that 25 percent of offspring will be red-eyed males?

Which combination of alleles best describes a sex-linked trait?

What was Thomas Hunt Morgan's main contribution to science?

Which allele combination represents a female who has a heterozygous sex-linked trait?

Red-green color blindness is an X-linked recessive disorder. mc008-1.jpg What is the probability of having red-green color blindness for the cross that is represented by the Punnett square?

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome. mc024-1.jpg If Brian has a son who is color-blind, what is known about the genotype of the son's mother?

Mendel's pea plants had either purple or white flowers. This means that the plants

Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. mc015-1.jpg Who has hemophilia in the pedigree that is shown?

The pedigree traces red-green color blindness. mc021-1.jpg Which family members have red-green color blindness?

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods?

The diagram represents meiosis. mc015-1.jpg Which of Mendel's laws or principles of inheritance can be explained by the diagram?

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. An incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result. Then, two of the purple offspring are crossed. According to the Punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance?

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?

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

Parents with the genotypes AO and AB have a child. What are all the possible blood types of the child?