Question 1

A plant with genotype $Aa$ is crossed with a plant with genotype $aa$. What is the expected genotypic ratio among the offspring?

Accepted Answer

$1\ Aa : 1\ aa$

Question 2

Which of the following best describes Mendel's Law of Segregation?

Accepted Answer

Each individual has two alleles for each gene, and these alleles separate during gamete formation so that each gamete receives only one allele

Question 3

A true-breeding plant is crossed with another true-breeding plant with a different phenotype. The F1 generation all display the same phenotype. What does this indicate about the trait?

Accepted Answer

The trait is controlled by a dominant and a recessive allele

Question 4

In a pedigree, a colored-in square represents:

Accepted Answer

A male who is affected

Question 5

Which of the following best explains why X chromosome inactivation occurs in female mammals?

Accepted Answer

To equalize the dosage of X-linked genes between males and females

Question 6

A mutation that changes the amino acid composition of a protein is most likely to affect phenotype by:

Accepted Answer

Altering the structure and function of the protein

Question 7

During which phase of the eukaryotic cell cycle does DNA replication occur?

Accepted Answer

$S$ phase

Question 8

If a cell does not pass a cell cycle checkpoint, what is the most likely immediate outcome?

Accepted Answer

DNA repair mechanisms will be activated

Question 9

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

Homologous chromosomes pair and separate during meiosis I, but not during mitosis

Question 10

A woman who is heterozygous for an X-linked recessive trait and a man who does not have the trait have a son. What is the probability that their son will express the trait?

Accepted Answer

$0.5$

Question 11

Which of the following best describes incomplete dominance?

Accepted Answer

The heterozygote displays a phenotype intermediate between the two homozygotes

Question 12

A test cross is performed between an individual with an unknown genotype and a homozygous recessive individual. If half the offspring display the dominant phenotype and half display the recessive phenotype, what is the genotype of the unknown parent?

Accepted Answer

Heterozygous

Question 13

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affecting both eye color and blood pressure

Question 14

What is the main purpose of a pedigree in genetics?

Accepted Answer

To track the inheritance of traits across generations

Question 15

Which of the following best describes the law of independent assortment?

Accepted Answer

Alleles of different genes assort independently during gamete formation

Question 16

A male is affected by an X-linked recessive disorder. Which of the following is true about his genotype?

Accepted Answer

He has one copy of the mutant allele on his X chromosome

Question 17

Which of the following mechanisms is NOT typically involved in epigenetic regulation?

Accepted Answer

Change in DNA sequence

Question 18

During which stage of meiosis do homologous chromosomes pair and crossing over occur?

Accepted Answer

Prophase I

Question 19

A cell is observed to have chromosomes aligned at the metaphase plate, with sister chromatids facing opposite poles. Which phase is this cell in?

Accepted Answer

Metaphase

Fundamental Concepts in Genetics: Mendelian Principles, Chromosome Dynamics, and Epigenetics

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