Question 1

Which of the following best describes the central dogma of molecular biology as depicted in the study materials?

Accepted Answer

DNA is transcribed into mRNA, which is then translated into protein.

Question 2

A calico kitten displays patches of different fur colors due to genetic information. This is an example of which of the following genetic concepts?

Accepted Answer

Phenotype

Question 3

Which field of genetics is primarily concerned with the inheritance patterns of traits across generations, as established by Gregor Mendel?

Accepted Answer

Transmission genetics

Question 4

A scientist is studying a mutant gene that results in the loss of insulin production in humans. Which field of genetics does this research most closely align with?

Accepted Answer

Molecular genetics

Question 5

Population geneticists use mathematical models to predict allele frequencies in a population. If a population has two alleles, A and a, and the frequency of A is $$p$$ and a is $$q$$, which equation must always be true?

Accepted Answer

$$p + q = 1$$

Question 6

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They have the same genes at the same loci but may have different alleles.

Question 7

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

Accepted Answer

S phase

Question 8

A nerve cell in an adult human is unlikely to divide again. In which phase of the cell cycle would you expect to find this cell?

Accepted Answer

G0 phase

Question 9

Which of the following events distinguishes anaphase of mitosis from anaphase I of meiosis?

Accepted Answer

Sister chromatids separate in mitosis, while homologous chromosomes separate in meiosis I.

Question 10

In a plant cell undergoing cytokinesis, what structure forms to separate the two daughter cells?

Accepted Answer

Cell plate

Question 11

If a diploid organism has a haploid number $$n = 4$$, how many different combinations of chromosomes can be produced in its gametes due to independent assortment?

Accepted Answer

$$2^4 = 16$

Question 12

Which of the following best explains why meiosis is necessary for sexual reproduction in diploid organisms?

Accepted Answer

It reduces the chromosome number by half, preventing chromosome doubling in each generation.

Question 13

During which substage of Prophase I in meiosis does crossing over occur, and what is the significance of this event?

Accepted Answer

Pachytene; it increases genetic variation by exchanging DNA between homologous chromosomes.

Question 14

A human cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

46

Question 15

Which structure is responsible for connecting homologous chromosomes during Prophase I of meiosis?

Accepted Answer

Synaptonemal complex

Question 16

A mutation eliminates the function of a gene responsible for forming the Z-ring in bacteria. What process would be directly affected?

Accepted Answer

Binary fission

Question 17

Which of the following is a direct outcome of mitosis and cytokinesis in multicellular eukaryotes?

Accepted Answer

Production of two genetically identical diploid cells

Question 18

If a human gamete contains 23 chromosomes, how many possible chromosome combinations can be produced by independent assortment alone?

Accepted Answer

$$2^{23} = 8$$,388,608$$

Question 19

Which of the following best describes the difference between a gene and an allele?

Accepted Answer

A gene is a segment of DNA that codes for a trait, while an allele is a variant form of that gene.

Question 20

Which of the following events occurs during metaphase of mitosis?

Accepted Answer

Chromosomes align along the metaphase plate, each attached to both spindle poles by kinetochore microtubules.

Genetics and Cell Division: Study Notes (Chapters 1 & 2)

Guida di studio - Domande di pratica

Study guide - Flashcard