What is DNA?

Which of the following properties of DNA was discovered by James Watson and Francis Crick?

Which of these terms best describes the structure of DNA?

Kara has a plant that produces either purple or white flowers. She crosses a plant that has two recessive alleles for white flowers with a plant that has two dominant alleles for purple flowers. Which result would be true of all of the offspring?

Gregor Mendel observed that two plants with purple flowers could produce some offspring with white flowers and some offspring with purple flowers. Which of the following did Mendel use to explain this result?

DNA contains genes that provide instructions for inherited traits. What is the relationship between the genes and chromosomes?

Which of these choices describes a segment of DNA that determines a specific trait in a person, such as attached earlobes?

Raylene inherited certain physical characteristics from her parents. Which of these follow is not an inherited characteristic?

For a particular type of plant, red flowers (R) are dominant to white flowers (r). If a plant with the genotype RR is crossed with a plant with the genotype Rr, what percent of the offspring are expected to have red flowers?

For a type of pea plant, round seeds (R) are dominant to wrinkled seeds (r). A pea plant with the genotype Rr is crossed with another pea plant with the genotype Rr. What percent of the offspring are expected to have wrinkled seeds?

Red flowers (R) are dominant to white flowers (r). What percent of offspring would have red flowers if a plant with a red flower phenotype and the genotype Rr was crossed with another plant with a red flower phenotype and the genotype Rr?

Gregor Mendel studied genetics by crossing pea plants that had different traits. Which of these choices is an example of what Mendel described as a dominant trait?

Ryan notices that all of his friend’s brothers and sisters are tall. What is the most likely explanation for this characteristic?

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