Question 1

Which of the following best describes the hypothesis of blending inheritance?

Accepted Answer

Offspring have traits that are intermediate between those of their parents, as parental traits blend together.

Question 2

In Mendel's monohybrid cross between pure-breeding round-seeded and wrinkled-seeded pea plants, what was the observed phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$

Question 3

Which of the following statements is consistent with Mendel's principle of segregation?

Accepted Answer

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

Question 4

A testcross is used to determine the genotype of a parent with a dominant phenotype. Which parent is used in the testcross?

Accepted Answer

A parent that is homozygous recessive for the trait.

Question 5

Which of the following is an example of inheritance of acquired characteristics, as proposed by Lamarck?

Accepted Answer

A blacksmith develops strong arm muscles and passes this trait to his children.

Question 6

Which of the following best explains why Mendel’s results did not support the blending inheritance hypothesis?

Accepted Answer

The F2 generation showed a reappearance of the recessive trait, not a blend.

Question 7

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

Accepted Answer

$$9:3:3:1$$

Question 8

Which of the following is true about genes and alleles according to Mendel’s findings?

Accepted Answer

Different alleles are responsible for variation in traits.

Question 9

If a gene exhibits incomplete dominance, what would be the phenotype of a heterozygote (Rr) if RR is red and rr is white?

Accepted Answer

Pink

Question 10

Which of the following best describes codominance?

Accepted Answer

Both alleles in a heterozygote are fully expressed in the phenotype.

Question 11

Which of the following is a real-world example of multiple allelism in humans?

Accepted Answer

ABO blood group system

Question 12

A male with hemophilia (an X-linked recessive disorder) and a female who is a carrier for hemophilia have a child. What is the probability that their son will have hemophilia?

Accepted Answer

$$0.5$$

Question 13

Which of the following best explains why genes located far apart on the same chromosome can assort independently?

Accepted Answer

Crossing over during meiosis can separate them, allowing independent assortment.

Question 14

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affecting both fur color and eye color in mice.

Question 15

In Mendel’s experiments, what was the significance of using true-breeding (pure line) plants?

Accepted Answer

They provided consistent, predictable parental genotypes for crosses.

Question 16

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

Accepted Answer

Alleles of different genes are transmitted independently of each other during gamete formation.

Question 17

A plant with genotype RrYy is crossed with a plant with genotype rryy. What proportion of the offspring will have round seeds and yellow pods if R (round) and Y (yellow) are dominant?

Accepted Answer

$$1/4$$

Question 18

Which of the following is a key difference between autosomal and sex-linked inheritance?

Accepted Answer

Autosomal genes are inherited equally by both sexes, while sex-linked genes may show different inheritance patterns in males and females.

Question 19

Which of the following scenarios best illustrates epistasis?

Accepted Answer

A gene for flower color is masked by a gene that controls pigment production.

Question 20

Which of the following best explains why most human traits do not follow simple Mendelian inheritance patterns?

Accepted Answer

Most traits are influenced by multiple genes and environmental factors, resulting in continuous variation.

Mendelian Genetics: Principles of Inheritance

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