Mendel and the Gene Idea

An educational illustration depicting Mendelian genetics concepts, featuring pea plants, Punnett squares, and genetic traits like eye color and fur color.

Mendelian Genetics Quiz

Test your knowledge of Mendelian genetics with this engaging quiz! Dive deep into the principles that govern heredity and explore questions ranging from basic concepts to more complex genetic scenarios.

Whether you are a student, teacher, or just a genetics enthusiast, this quiz will help you:

Understand key genetic concepts
Apply your knowledge to solve problems
Learn about the contributions of Gregor Mendel

20 Questions5 MinutesCreated by TeachingTree247

Black eyes are dominant to orange eyes, and green skin in dominant to white skin, Sam, a MendAlien with black eyes and green skin, has a parent with orange eyes and white skin. Carole is MendAlien with orange eyes and white skin. If Sam and Carole were to mate, the predicted ratio of their offspring would be:

A. 3 black eyes, green skin: 3 black eyes, white skin: 9 orange eyes, green skin: 1 orange eyes, white skin

B. 1 black eyes, green skin: 1 black eyes, white skin: 1 orange eyes, green skin: 1 orange eyes, white skin

C. 1 black eyes, green skin: 3 black eyes, white skin: 3 orange eyes, green skin: 9 orange eyes, white skin

D. There is insufficient information to determine Sam's genotype.

E. 9 black eyes, green skin: 3 black eyes, white skin: 3 orange eyes, green skin: 1 orange eyes, white skin

What is a genetic cross between an individual showing a dominant phenotype (but of unknown genotype) and a homozygous recessive individual called?

Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of the cross BbTt x BBtt will have black fur and long tails?

Sickle-cell disease represents

A. Multiple alleles, pleiotropy, and blended inheritance.

B. Codominance and pleiotropy.

C. Codominance and multiple alleles.

D. Multiple alleles and pleiotropy.

E. Codominance and blended inheritance.

A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?

What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?

A. An organism that is homozygous for many recessive traits is at a disadvantage.

B. There is considerable genetic variation in garden peas.

C. Genes are composed of DNA.

D. Recessive genes occur more frequently in the F1 than do dominant ones.

E. Traits are inherited in discrete units, and are not the results of "blending."

People with sickle-cell trait

A. Are heterozygous for the sickle-cell allele.

B. Have increased resistance to malaria.

C. All of the choices are correct.

D. Produce normal and abnormal hemoglobin.

E. Are usually healthy.

A couple has three children, all of whom have brown eyes and blonde hair. Both parents are homozygous for brown eyes (BB), but one is a blond (rr) and the other is a redhead (Rr). What is the probability that their next child will be a brown-eyed redhead?

When a disease is said to have a multifactorial basis, it means that

A. It tends to skip a generation.

B. It affects a large number of people.

C. It has many different symptoms.

D. It is caused by a gene with a large number of alleles.

E. Many factors, both genetic and environmental, contribute to the disease.

Alleles of a gene are found at ____________________ chromosomes.

A. The same locus on homologous mitochondrial

B. Different loci on heterologous

C. The same locus on heterozygous

D. The same locus on homologous

E. Different loci on homologous

In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous offspring of red and white homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red: 2 roan: 1 white?

Which of the following is an example of polygenic inheritance?

A. Huntington's disease in humans

B. the ABO blood groups in humans

C. White and purple flower color in peas

D. Pink flowers in snapdragons

E. Skin pigmentation in humans

Imagine that beak color in a finch species is controlled by a single gene. You mate a finch homozygous for orange (pigmented) beak with a finch homozygous for ivory (unpigmented) beak and get numerous offspring, all of which has a pale, ivory-orange beak. This pattern of color expression is most likely to be an example of

Tallness (T) is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?

Which of the following best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?

A. Many lethal recessive alleles cause enhanced disease resistance when they are present in the heterozygous state, and carriers of these alleles have more children, on average, than other people.

B. Most individuals that have a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce.

C. Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause death in the embryo.

D. The presence of a lethal dominant allele causes sterility.

E. Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused by recessive alleles.

Which of the following techniques involves the preparation of a karyotype?

A. amniocentesis

B. Both amniocentesis and chorionic villus sampling

C. amniocentesis, chorionic villus sampling, and fetoscopy

D. fetoscopy

E. Chorionic villus sampling

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