Exam 6: Patterns of Inheritance

A chestnut-colored horse is mated with a cremello (cream-colored) horse. Over a 10-year period, all of their offspring are palominos. This pattern of inheritance is best explained by

A single gene with one dominant allele for black hair (B) and one recessive allele for brown hair (b) controls hair color in mice. A male mouse with black hair mates with a female mouse with brown hair and they have 12 offspring. Are you able to determine the predicted ratio of hair color in their offspring using a Punnett square? Explain your answer.

One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU). PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color, eczema, and a "mousy" smell). By detecting PKU early, doctors are able to reduce the effect of this condition with a modified diet. PKU is an example of

Which of the following is the mechanism described by Mendel that results in a new combination of alleles in a pea plant seed?

The observable physical characteristics of an organism are known as its ________.

The pleiotropy that occurs when a single gene controls multiple skeletal traits in dogs, such as leg bone length and skull size, may be explained because

Which of the following statements is NOT true?

Which of the following represents all of the possible gametes that can be formed by an individual with the genetic makeup FfGgHH?

Is it possible for two organisms with the same genotype to have different phenotypes? Explain your answer.

A thoroughbred racehorse could have at most ________ alleles of the same gene.

Differentiate between pleiotropy and polygenic traits.

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring analyzed. Which of the following statements about this situation is true?

Which of the following is true for mutations?

Which of the following statements regarding genes is NOT true?

The 9:3:3:1 ratio of phenotypes that occurs in the F2 generation of the cross shown can be explained using

Which of the following statements explains how genetically identical plant clones can exhibit dramatic phenotypic variation?

Which of the following did Mendel use to help him form the law of independent assortment?

Mendel's manuscript discussing his pea-breeding results is considered one of the two most important scientific papers of the nineteenth century because he was the first to explain how

If Gregor Mendel had studied a polygenic trait that did not follow the straightforward single-gene, single-phenotype pattern, do you believe he would have been able to describe how genes are passed from parents to offspring? Justify your answer.

The leaf color of a certain plant is controlled by one gene. For that gene, the allele G = orange and g = green. You have a plant with orange leaves, but do not know whether that plant's genotype is GG or Gg. Which of the following would help you determine the plant's genotype?