Question 1

Which process is illustrated in the first image, where two homologous chromosomes exchange segments, and what is its main evolutionary benefit?

Accepted Answer

Crossing over; it increases genetic diversity in offspring.

Question 2

In the context of Mendelian genetics, what is the expected phenotypic ratio in the F2 generation when two heterozygous plants (Pp) are crossed for a single gene with complete dominance?

Accepted Answer

$$3:1$$

Question 3

Which experiment demonstrated that DNA, and not protein or RNA, is the transforming principle responsible for heredity?

Accepted Answer

Avery-MacLeod-McCarty experiment

Question 4

A bacterium acquires new genetic material from its environment and incorporates it into its genome. What is this process called?

Accepted Answer

Transformation

Question 5

If two genes are located very close together on the same chromosome, which of the following is most likely true?

Accepted Answer

They are likely to be inherited together due to genetic linkage.

Question 6

Which of the following best describes the outcome of the Hershey-Chase blender experiment?

Accepted Answer

Phosphorus-labeled DNA entered the bacterial cells, proving DNA is the genetic material.

Question 7

Which mechanism of genetic recombination in bacteria involves a virus transferring DNA from one bacterium to another?

Accepted Answer

Transduction

Question 8

A scientist observes that after crossing two plants, the offspring show a 9:3:3:1 phenotypic ratio. What type of genetic cross does this ratio indicate?

Accepted Answer

A dihybrid cross involving two independently assorting genes

Question 9

Which of the following statements about Mendel’s principle of segregation is correct?

Accepted Answer

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

Question 10

In a bacterial conjugation experiment, which cell type contains the F factor and acts as the DNA donor?

Accepted Answer

F+ cell

Question 11

Which of the following best explains why sexual reproduction increases genetic diversity?

Accepted Answer

It combines alleles from two parents and allows for recombination during meiosis.

Question 12

A plant with genotype RrYy is crossed with another plant of the same genotype. If the genes assort independently, what is the probability of obtaining an offspring with genotype rryy?

Accepted Answer

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

Question 13

Which of the following is a correct definition of a locus?

Accepted Answer

The specific physical location of a gene on a chromosome

Question 14

Which of the following is NOT a mechanism of genetic recombination in bacteria?

Accepted Answer

Meiosis

Question 15

If a gene is described as 'true-breeding,' what does this mean about the organism's genotype for that gene?

Accepted Answer

It is homozygous for that gene.

Question 16

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable traits.

Question 17

A scientist is mapping two genes and finds that the recombination frequency between them is 15%. How many map units apart are these genes?

Accepted Answer

$$15$$ centimorgans

Question 18

Which of the following is an example of a dominant allele?

Accepted Answer

An allele that determines the phenotype in both homozygous and heterozygous individuals.

Question 19

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

Accepted Answer

Alleles of different genes segregate independently during gamete formation.

Question 20

Which of the following is a real-world application of bacterial transformation?

Accepted Answer

Producing genetically modified bacteria that express human insulin.

Mendelian Genetics and Genetic Recombination: Study Notes for Cell Biology

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