Mendelian Inheritance: Online Quizzes and Learning Resources

Question 1

An individual homozygous recessive for a specific trait will produce which type of gametes?

Accepted Answer

Gametes carrying only the recessive allele.

Answer

Gametes carrying only the dominant allele.

Answer

Gametes carrying a combination of dominant and recessive alleles, depending on the specific trait.

Answer

Gametes carrying both the dominant and recessive alleles.

Question 2

A cross between a homozygous dominant individual (AA) and a homozygous recessive individual (aa) for a specific trait will produce offspring with what genotype?

Accepted Answer

All heterozygous (Aa).

Answer

A mixture of homozygous dominant (AA) and homozygous recessive (aa).

Answer

All homozygous dominant (AA).

Answer

All homozygous recessive (aa).

Question 3

A woman with blood type A and a man with blood type B have a child with blood type O. What are the genotypes of the parents?

Accepted Answer

Mother: IAi, Father: IBi

Answer

Mother: IAi, Father: IBIB

Answer

Mother: IAIA, Father: IBIB

Answer

Mother: ii, Father: ii

Question 4

If both parents are carriers of the cystic fibrosis allele (Cc), what is the probability of their child having cystic fibrosis?

Accepted Answer

25%

Answer

50%

Answer

75%

Answer

100%

Question 5

A test cross involves crossing an individual with an unknown genotype for a trait with a homozygous recessive individual. What is the primary purpose of this cross?

Accepted Answer

To determine the genotype of the unknown individual.

Answer

To determine the phenotype of the unknown individual.

Answer

To confirm the law of segregation.

Question 6

Which statement accurately describes the law of segregation?

Accepted Answer

During gamete formation, the two alleles for each trait separate, and each gamete receives only one allele.

Answer

Alleles for different traits assort independently of each other during gamete formation.

Question 7

A red-flowered plant is crossed with a white-flowered plant, and all offspring have pink flowers. This is an example of:

Accepted Answer

Incomplete dominance

Answer

Codominance

Answer

Recessive inheritance

Answer

Complete dominance

Question 8

A father has Huntington's disease, an autosomal dominant disorder, and the mother is unaffected. What is the probability of their child inheriting the disorder?

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 9

A woman with blood type A and a man with blood type B have a child with blood type O. What are the genotypes of the parents?

Accepted Answer

Mother: I^Ai, Father: I^Bi

Answer

Mother: I^Ai, Father: I^BI^B

Answer

Mother: I^AI^A, Father: I^BI^B

Answer

Mother: I^AI^A, Father: I^Bi

Question 10

A homozygous dominant pea plant with purple flowers (PP) is crossed with a homozygous recessive plant with white flowers (pp). What is the phenotypic ratio of the offspring?

Accepted Answer

100% purple flowers

Answer

25% purple flowers, 75% white flowers

Answer

75% purple flowers, 25% white flowers

Answer

50% purple flowers, 50% white flowers

Question 11

A plant with genotype AaBb is crossed with another plant with genotype AaBb. What is the probability of an offspring inheriting the genotype AABB?

Accepted Answer

1/16

Answer

1/8

Answer

1/4

Answer

1/2

Question 12

Which of the following is NOT a characteristic of Mendelian inheritance?

Accepted Answer

Traits are always expressed in a continuous spectrum.

Answer

Alleles segregate during gamete formation.

Answer

Traits are controlled by specific genes.

Question 13

A woman with cystic fibrosis (a recessive disorder) marries a man who is a carrier for the disease. What is the probability of their child inheriting the disease?

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 14

A couple has four children, all of whom have brown eyes. Both parents have brown eyes, but the father's mother had blue eyes. What can be concluded about the father's genotype?

Accepted Answer

He must be heterozygous for eye color.

Answer

He must be homozygous recessive for eye color.

Answer

It's impossible to determine his genotype based on this information.

Answer

He must be homozygous dominant for eye color.

Question 15

Which of the following statements accurately describes the Law of Segregation?

Accepted Answer

During gamete formation, the two alleles for a trait separate, so that each gamete receives only one allele.

Answer

Alleles for different traits are inherited together.

Question 16

In a cross between two pea plants, one with yellow seeds (YY) and the other with green seeds (yy), what is the expected genotypic ratio in the F1 generation?

Accepted Answer

100% Yy

Answer

3:1 (YY:Yy:yy)

Answer

1:2:1 (YY:Yy:yy)

Answer

1:1 (YY:yy)

Question 17

A fruit fly with genotype AaBb is crossed with a fruit fly with genotype aabb. What is the phenotypic ratio expected in their offspring?

Accepted Answer

1:1:1:1 (AB:Ab:aB:ab)

Answer

9:3:3:1

Answer

3:1

Question 18

Which of the following scenarios demonstrates the concept of incomplete dominance?

Accepted Answer

A red flower crossed with a white flower produces pink flowers.

Answer

Two parents with brown eyes have a child with blue eyes.

Answer

A homozygous dominant individual expresses the dominant trait.

Question 19

In a pea plant, the allele for tall (T) is dominant over the allele for short (t). If a heterozygous tall plant (Tt) is crossed with a short plant (tt), what is the probability of producing a tall offspring?

Accepted Answer

50%

Answer

100%

Answer

25%

Answer

75%

Question 20

Which of the following genotypes represents a homozygous dominant individual?

Accepted Answer

AA

Answer

aA

Answer

Aa

Answer

aa

Question 21

In a cross between a red-flowered plant (RR) and a white-flowered plant (rr), all the F1 offspring are pink-flowered (Rr). This is an example of:

Accepted Answer

Incomplete dominance

Answer

Codominance

Answer

Complete dominance

Answer

Epistasis

Question 22

Which of the following traits in humans is an autosomal recessive?

Accepted Answer

Cystic fibrosis

Answer

Blood type A

Answer

Eye color

Question 23

The probability of inheriting two recessive alleles from heterozygous parents is:

Accepted Answer

25%

Answer

75%

Answer

100%

Answer

50%

Question 24

Which of the following is a genetic disorder caused by a dominant allele?

Accepted Answer

Huntington's disease

Answer

Tay-Sachs disease

Answer

Cystic fibrosis

Answer

Sickle cell anemia