Q: Which of the following equations correctly represents the number of Barr bodies in a human cell?

$$\text{Number of Barr bodies} = \text{Number of X chromosomes} - 1$$

Question 1

Which process involves the uptake of extracellular DNA by a bacterial cell and its incorporation into the chromosome through homologous recombination?

Accepted Answer

Transformation

Question 2

During generalized transduction, what is the source of the DNA that is transferred to the recipient bacterium?

Accepted Answer

Random fragments of donor bacterial DNA

Question 3

A bacteriophage accidentally packages bacterial DNA instead of its own during assembly. What is this process called?

Accepted Answer

Generalized transduction

Question 4

Which of the following best describes nondisjunction during meiosis?

Accepted Answer

Failure of homologous chromosomes or sister chromatids to separate

Question 5

A human karyotype shows 47 chromosomes, including two X chromosomes and one Y chromosome. What syndrome does this represent?

Accepted Answer

Klinefelter syndrome (47,XXY)

Question 6

In temperature-dependent sex determination (TSD) in reptiles, what determines the sex of the offspring?

Accepted Answer

The incubation temperature during a critical developmental window

Question 7

Which of the following is true about the X and Y chromosomes in humans?

Accepted Answer

The X chromosome is larger and contains more genes than the Y chromosome

Question 8

If a gene is frequently co-inherited with another gene, what does this suggest about their location?

Accepted Answer

They are close together on the same chromosome

Question 9

How many Barr bodies would you expect to find in a cell from an individual with a 47,XXY karyotype?

Accepted Answer

1

Question 10

Which of the following best explains why X-inactivation is important in mammals?

Accepted Answer

It ensures that males and females have the same number of active X chromosomes

Question 11

Which process is described as the transfer of bacterial DNA from one bacterium to another by a bacteriophage?

Accepted Answer

Transduction

Question 12

A researcher observes that two genes are almost always inherited together. Which genetic mapping technique could help determine their relative positions?

Accepted Answer

Conjugation mapping

Question 13

Which of the following is a key difference between transformation and transduction?

Accepted Answer

Transformation involves uptake of naked DNA, while transduction involves DNA transfer via a phage

Question 14

Which of the following equations correctly represents the number of Barr bodies in a human cell?

Accepted Answer

$$	ext{Number of Barr bodies} = 	ext{Number of X chromosomes} - 1$$

Question 15

Which of the following scenarios is an example of horizontal gene transfer?

Accepted Answer

A bacterium acquires DNA from the environment and incorporates it into its genome

Question 16

In a species with temperature-dependent sex determination, what would likely happen if all eggs were incubated at a temperature that only produces males?

Accepted Answer

The population would become all male

Question 17

Which of the following best describes homologous recombination during bacterial transformation?

Accepted Answer

The incoming DNA is integrated into the bacterial chromosome at a homologous region

Question 18

A geneticist observes a human cell with 45 chromosomes, including only one X chromosome and no Y chromosome. What is the most likely diagnosis?

Accepted Answer

Turner syndrome

Question 19

Which of the following statements about human chromosomes is correct?

Accepted Answer

Humans have 22 pairs of autosomes and one pair of sex chromosomes

Question 20

Which of the following is a consequence of nondisjunction during meiosis I?

Accepted Answer

Half of the gametes have an extra chromosome, and half are missing a chromosome

Week 4

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