Q: Which formula would you use to calculate the probability of two independent events both occurring?

$$P(A \times B) = P(A) \times P(B)$$

Question 1

Which of the following best describes a gene?

Accepted Answer

A segment of DNA that codes for a specific protein or functional RNA.

Question 2

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

Accepted Answer

S phase

Question 3

Which organelle is primarily responsible for organizing the spindle fibers during mitosis?

Accepted Answer

Centrosome

Question 4

Homologous chromosomes differ from sister chromatids in that:

Accepted Answer

Homologous chromosomes carry the same genes but may have different alleles, while sister chromatids are identical copies formed during DNA replication.

Question 5

What is checked at the G2 checkpoint during the cell cycle?

Accepted Answer

Whether DNA replication is complete and undamaged.

Question 6

Which of the following correctly describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis maintains chromosome number, while meiosis reduces chromosome number by half.

Question 7

In human oogenesis, which cell is directly produced after the first meiotic division?

Accepted Answer

Secondary oocyte

Question 8

Which of Mendel's postulates explains the independent inheritance of two genes located on different chromosomes?

Accepted Answer

Law of Independent Assortment

Question 9

How is the Punnett square related to meiosis?

Accepted Answer

It models the random fusion of gametes produced by meiosis.

Question 10

Which formula would you use to calculate the probability of two independent events both occurring?

Accepted Answer

$$P(A 	imes B) = P(A) 	imes P(B)$$

Question 11

A dihybrid cross between two heterozygotes (AaBb x AaBb) produces what phenotypic ratio in the offspring, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 12

Which scenario best illustrates incomplete dominance?

Accepted Answer

A cross between red and white flowers produces pink flowers.

Question 13

Which of the following is an example of codominance?

Accepted Answer

AB blood type in humans, where both A and B alleles are expressed equally.

Question 14

If a gene exhibits recessive lethal alleles, what is the expected ratio of viable to non-viable offspring in a cross between two heterozygotes?

Accepted Answer

$$2:1$$

Question 15

Which type of gene interaction results in one gene masking the expression of another gene at a different locus?

Accepted Answer

Epistasis

Question 16

What is the purpose of a reciprocal cross in genetics?

Accepted Answer

To determine if a trait is sex-linked by reversing the sexes of the parents.

Question 17

Which equation represents the binomial theorem for calculating probabilities in genetic crosses?

Accepted Answer

$$(a + b)^n$$

Question 18

Which statement about spermatogenesis and oogenesis in humans is correct?

Accepted Answer

Spermatogenesis produces four functional sperm cells, while oogenesis produces one functional ovum and three polar bodies.

Question 19

A geneticist crosses two plants, one with genotype AaBb and one with genotype aabb. What is the probability that an offspring will have genotype AaBb? (Assume independent assortment.)

Accepted Answer

$$1/4$$

Genetics Study Guide: Key Concepts and Processes

Study Guide - Practice Questions

Study Guide - Flashcards