Question 1

A woman with blood type A (genotype AO) and a man with blood type B (genotype BO) have a child. What is the probability that their child will have blood type AB?

Accepted Answer

$$\frac{1}{4}$$

Question 2

In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), what is the expected phenotypic ratio among the offspring, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 3

A fruit fly geneticist performs a testcross between a fly heterozygous for two linked genes (AB/ab) and a fly homozygous recessive (ab/ab). If the recombination frequency between the two genes is 20%, what percentage of the offspring will be recombinant types?

Accepted Answer

$$20\%$$

Question 4

Which of the following best describes the difference between incomplete dominance and codominance?

Accepted Answer

In incomplete dominance, the heterozygote shows an intermediate phenotype; in codominance, both alleles are fully expressed in the heterozygote.

Question 5

A male with an X-linked recessive disorder marries a woman who is a carrier for the same disorder. What is the probability that their son will have the disorder?

Accepted Answer

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

Question 6

Which of the following statements about the Meselson-Stahl experiment is correct?

Accepted Answer

It provided evidence for the semi-conservative model of DNA replication.

Question 7

During DNA replication, which enzyme is responsible for synthesizing the RNA primer required for DNA polymerase to begin synthesis?

Accepted Answer

Primase

Question 8

Which of the following best describes the difference between conjugation and transduction in bacteria?

Accepted Answer

Conjugation involves the transfer of DNA via a pilus; transduction involves DNA transfer by a bacteriophage.

Question 9

A plant breeder observes that crossing two white-flowered plants produces some offspring with purple flowers. Which genetic phenomenon best explains this observation?

Accepted Answer

Complementation

Question 10

Which of the following chromosomal aberrations results in an individual with 2n+1 chromosomes?

Accepted Answer

Trisomy

Question 11

Which of the following is a key difference between nuclear and extranuclear inheritance?

Accepted Answer

Nuclear inheritance follows Mendelian patterns, while extranuclear inheritance often shows maternal inheritance.

Question 12

Which of the following best describes the function of Okazaki fragments during DNA replication?

Accepted Answer

They are short DNA fragments synthesized on the lagging strand.

Question 13

Which of the following is NOT a component of a typical prokaryotic operon?

Accepted Answer

Enhancer

Question 14

A mutation in the lacI gene of the lac operon results in a nonfunctional repressor protein. What is the expected effect on the expression of the lac operon in the absence of lactose?

Accepted Answer

The operon will be constitutively expressed.

Question 15

Which of the following best describes the difference between structural genomics and functional genomics?

Accepted Answer

Structural genomics involves sequencing and mapping genomes; functional genomics studies gene function and expression.

Question 16

Which of the following is a real-world application of recombinant DNA technology in medicine?

Accepted Answer

Production of synthetic insulin for diabetes treatment

Question 17

Which of the following best explains why the Human Genome Project (HGP) was initially controversial?

Accepted Answer

There were concerns about ethical, legal, and social implications of having access to complete human genetic information.

Question 18

Which of the following is a key feature of cancer cells compared to normal cells?

Accepted Answer

Cancer cells often lose contact inhibition and can invade surrounding tissues.

Question 19

A patient is found to have a mutation in the BRCA1 gene. What is the most likely consequence of this mutation?

Accepted Answer

Increased risk of developing breast and ovarian cancer

Question 20

Which of the following best describes the role of p53 in the cell cycle?

Accepted Answer

p53 acts as a tumor suppressor by inducing cell cycle arrest or apoptosis in response to DNA damage.

Comprehensive Genetics Final Exam Study Guide

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