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Exam 11: Mendel and His Discoveries

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Question 21

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If an individual exhibits a recessive trait, which of the following statements can you be sure of?

A) The phenotype for this trait is different from the phenotype of the homozygous dominant genotype for this trait.
B) The genotype of this trait will be heterozygous.
C) Both parents of this individual had the same genotype for this trait.
D) Any siblings of this individual will have the same phenotype for this trait.
E) Any children this individual has will always exhibit the trait, regardless of the genotype of the other parent.

F) D) and E)
G) A) and E)

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Question 22

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A "trihybrid cross would:

A) follow a gene for which there are three alleles.
B) be a cross involving gametes from three different individuals.
C) follow three traits in a cross.
D) follow a gene that affects three different traits.
E) follow a trait over three generations.

F) C) and D)
G) A) and E)

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Question 23

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Crossing red flowering snapdragons with white flowering snapdragons yields seeds that grow into snapdragons with pink flowers. This suggests that:

A, B, and O blood type in humans is controlled by a single gene with three alleles: I^A, I^B and i. Imagine a fourth allele for blood type, I^C. If it is codominant with I^A and I^B, and dominant to i, how many possible blood type phenotypes are there?

A, B, and O blood type in humans is controlled by a single gene with three alleles: I^A, I^B and i. Type O is the recessive trait. The i allele is recessive to both I^A and I^B. Which of the following could be possible genotypes of the parents of a person with type O blood?

How many different types of gametes can be generated by an individual with genotype AaBB?

Refer to the figure above and then answer the question that follows. -In his basic experiments, Mendel began with true-breeding parental (P) plants. What did he see when he cross-fertilized P plants that had different traits?

What might be the current status of genetics if Mendel had never done his experiments with garden peas?

Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. What can you conclude about the parents?

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When F₂ plants, all with the heterozygous phenotype, are self-fertilized, the offspring have dominant and recessive traits in a 3:1 ratio.

Consider the following information for a dihybrid cross. The dominant allele F codes for freckles, whereas the recessive allele f codes for no freckles. The dominant allele E codes for long eyelashes, whereas the recessive allele e codes for short eyelashes. Both parents have the genotypes of ee and Ff. Indicate the following: (1) the phenotype of both parents, (2) the possible gametes that each parent can make, (3) all of the possible phenotypes for the offspring, and (4) the phenotypic ratio obtained after the Punnett square is drawn.

The phenotypic ratio obtained in a dihybrid cross is 8:0:4:2. The number of offspring that are dominant for trait 1 and recessive for trait 2 is:

Analyze the validity of the two statements below: Statement A: If an individual is heterozygous for a particular trait, it means that the individual carries two different alleles on a set of homologous chromosomes. Statement B: If an individual is heterozygous for a particular trait, that individual produces dominant gametes 50 percent of the time.

Match Mendel's results in column 1 with the conclusion he drew from them in column 2. -When true-breeding P plants of different types are crossed, the offspring do not have a phenotype intermediate between the two parents.

Sickle-cell anemia is a disease whose phenotype includes not only anemia, but also damage to many different organs. All phenotypes, however, can be traced to a single gene. This is an example of :

To determine the probability of two events occurring at the same time,