Question 1

Which of the following statements best describes Mendel's Law of Segregation?

Accepted Answer

The two copies of a gene segregate from each other during gamete formation, so each gamete carries only one allele.

Question 2

In a monohybrid cross between two heterozygous tall pea plants (Tt x Tt), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$

Question 3

Which of the following is a key difference between the pangenesis theory and Mendel’s particulate theory of inheritance?

Accepted Answer

Mendel’s theory proposes that traits are inherited as discrete units, while pangenesis suggests blending of traits from all parts of the body.

Question 4

A dihybrid cross between two heterozygous pea plants (YyRr x YyRr) produces which phenotypic ratio in the F2 generation, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 5

Which of the following best explains why two brown-eyed parents can have a blue-eyed child?

Accepted Answer

Both parents are heterozygous for the blue eye allele, which is recessive.

Question 6

If a plant with genotype TtRrYy is self-crossed, how many different types of gametes can it produce, assuming independent assortment?

Accepted Answer

$$8$$

Question 7

Which of the following is NOT a reason Mendel chose garden peas for his experiments?

Accepted Answer

They have a long generation time.

Question 8

A test cross is performed between a plant with an unknown genotype for a dominant trait and a homozygous recessive plant. If all offspring display the dominant phenotype, what is the genotype of the unknown parent?

Accepted Answer

Homozygous dominant

Question 9

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

Accepted Answer

Alleles of different genes assort independently during gamete formation.

Question 10

In a cross between TtRr x ttrr, what proportion of the offspring will be tall and round, assuming independent assortment?

Accepted Answer

$$1/4$$

Question 11

Which of the following scenarios would violate Mendel’s law of independent assortment?

Accepted Answer

Genes located close together on the same chromosome

Question 12

If a plant with genotype Tt is crossed with a plant with genotype tt, what is the probability that an offspring will be tall?

Accepted Answer

$$0.5$$

Question 13

Which of the following best explains the 3:1 phenotypic ratio observed in Mendel’s F2 generation for a monohybrid cross?

Accepted Answer

The dominant allele masks the recessive allele in heterozygotes.

Question 14

Which of the following is an example of a binary trait studied by Mendel?

Accepted Answer

Seed color: yellow or green

Question 15

A plant with genotype TtRrYy is crossed with a plant with genotype ttrryy. What is the probability that an offspring will be tall, round, and yellow?

Accepted Answer

$$1/8$$

Question 16

Which of the following is a direct result of genetic recombination?

Accepted Answer

Offspring with combinations of alleles different from either parent

Question 17

Which of the following best describes the outcome of a cross between two plants with genotypes Tt and TT?

Accepted Answer

All offspring will be tall

Question 18

Which of the following is a critical insight from Mendel’s experiments that refuted the blending theory of inheritance?

Accepted Answer

Traits reappear unchanged in the F2 generation after being masked in the F1 generation.

Mendelian Genetics: Principles, Experiments, and Applications

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