Question 1

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

Accepted Answer

Alleles for a trait separate during gamete formation, so each gamete carries only one allele for each gene.

Question 2

A pea plant with genotype BbSs is crossed with another plant of the same genotype. What is the expected proportion of offspring with genotype bbss?

Accepted Answer

$$\frac{1}{16}$$

Question 3

During which phase of mitosis do sister chromatids separate and move to opposite poles?

Accepted Answer

Anaphase

Question 4

If a cell has 46 chromosomes at the start of the cell cycle, how many chromatids will be present during the S phase?

Accepted Answer

$$92$$

Question 5

Which of the following is true about X-linked inheritance?

Accepted Answer

It refers to the inheritance of genes on the X chromosome.

Question 6

What is the main function of the centrosome during cell division?

Accepted Answer

It acts as the main microtubule-organizing center (MTOC) of the cell.

Question 7

In a dihybrid cross between BbSs x BbSs, what is the expected phenotypic ratio of the offspring?

Accepted Answer

$$9:3:3:1$$

Question 8

Which stage of the cell cycle is characterized by active gene expression and cell activity, preparing for DNA synthesis?

Accepted Answer

G1 phase

Question 9

During meiosis I, what is the result of crossing over between homologous chromosomes?

Accepted Answer

It increases genetic variation among gametes.

Question 10

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 11

Which of the following best explains the concept of 'wild type' in genetics?

Accepted Answer

The most common phenotype in a population.

Question 12

If a heterozygous individual (Bb) is crossed with a homozygous recessive individual (bb), what is the expected genotypic ratio of the offspring?

Accepted Answer

$$1:1$$

Question 13

Which process ensures that each gamete receives only one allele for each gene?

Accepted Answer

Law of segregation

Question 14

What is the role of spindle fibers during mitosis?

Accepted Answer

They attach to kinetochores and help separate sister chromatids.

Question 15

Which of the following events occurs during telophase of mitosis?

Accepted Answer

New nuclear envelopes form around each set of chromosomes.

Question 16

A woman who is a carrier for an X-linked recessive disorder marries a man who does not have the disorder. What is the probability that their son will have the disorder?

Accepted Answer

$$\frac{1}{2}$$

Question 17

Which of the following is a result of the law of independent assortment?

Accepted Answer

Alleles for different genes are inherited independently of each other.

Question 18

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

Accepted Answer

Prophase I

Question 19

If a cell undergoes meiosis, how many gametes are produced from one original cell?

Accepted Answer

$$4$$

Question 20

Which scientist's experiments with fruit flies helped confirm Mendel's rules of inheritance?

Accepted Answer

Thomas Hunt Morgan

Genetics Study Guide: Mendelian Inheritance, Cell Division, and Chromosome Behavior

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