Question 1

Which of the following best describes the difference between incomplete dominance and codominance, as illustrated by snapdragon flower color and the MN blood group in humans?

Accepted Answer

Incomplete dominance results in a phenotype that is intermediate between the two parental phenotypes, while codominance results in both parental phenotypes being fully and simultaneously expressed.

Question 2

The ABO blood group system in humans is an example of which genetic concept?

Accepted Answer

Multiple alleles

Question 3

Which of the following is an example of pleiotropy?

Accepted Answer

The gene for sickle-cell hemoglobin causing both anemia and resistance to malaria

Question 4

In Labrador retrievers, one gene determines whether pigment is produced (E/e), and another gene determines the color of the pigment (B/b). A dog with genotype eeBB will have which coat color?

Accepted Answer

Yellow

Question 5

Human skin color is an example of polygenic inheritance. Which of the following best explains this pattern?

Accepted Answer

Skin color is determined by multiple genes, each contributing to the overall phenotype.

Question 6

Which of the following is a quantitative character that exhibits polygenic inheritance?

Accepted Answer

Height

Question 7

The term 'multifactorial' refers to traits that are:

Accepted Answer

Influenced by both genetic and environmental factors

Question 8

The sickle-cell allele is considered recessive, incompletely dominant, and codominant. Which statement best explains this complexity?

Accepted Answer

It is recessive at the molecular level, incompletely dominant at the organismal level, and codominant at the cellular level.

Question 9

Why has the sickle-cell allele not been eliminated from populations in certain regions?

Accepted Answer

It provides a selective advantage against malaria in heterozygotes.

Question 10

Which of the following is NOT an advantage of using Drosophila melanogaster (fruit flies) in genetic studies?

Accepted Answer

They have a long lifespan, making generational studies easier.

Question 11

In Drosophila melanogaster, what are the sex chromosome combinations for males and females?

Accepted Answer

Males: XY, Females: XX

Question 12

Which of the following best defines a 'wild-type' phenotype?

Accepted Answer

A phenotype that is most commonly observed in natural populations

Question 13

Which gene is responsible for initiating male development in mammals?

Accepted Answer

SRY gene

Question 14

Which of the following statements about X-linked genes is correct?

Accepted Answer

They are found on the X chromosome and can affect both males and females.

Question 15

Which of the following is an example of a human X-linked gene?

Accepted Answer

Hemophilia

Question 16

What is X inactivation, and what structure does it produce in female cells?

Accepted Answer

The process by which one X chromosome is randomly inactivated, forming a Barr body

Question 17

Nondisjunction during meiosis can result in which of the following chromosomal abnormalities?

Accepted Answer

Aneuploidy, such as trisomy or monosomy

Question 18

Which human condition is caused by trisomy 21?

Accepted Answer

Down syndrome

Question 19

Which of the following is a possible result of a chromosomal deletion?

Accepted Answer

A segment of a chromosome is lost, potentially causing genetic disorders

Question 20

How can genes in mitochondria affect an organism, and what is a '3-parent baby'?

Accepted Answer

Mitochondrial genes can cause inherited diseases; a '3-parent baby' is produced by replacing defective mitochondria with healthy ones from a donor egg.

Study Guide: Non-Mendelian and Human Genetics (Chapters 14 & 15)

Study Guide - Practice Questions

Study Guide - Flashcards