Question 1

Gregor Mendel's success in discovering the basic principles of heredity was due in part to his use of pure-breeding strains. What is the significance of using pure-breeding strains in genetic experiments?

Accepted Answer

They allow for the consistent expression of traits, making it easier to track inheritance patterns.

Question 2

In Mendel's monohybrid cross between pure-breeding tall (TT) and dwarf (tt) pea plants, what is the expected genotypic ratio in the F2 generation after self-fertilization of the F1 plants?

Accepted Answer

$$1\ TT : 2\ Tt : 1\ tt$$

Question 3

Which of the following best describes the Principle of Independent Assortment as discovered by Mendel?

Accepted Answer

Each pair of alleles segregates independently of other pairs during gamete formation.

Question 4

A pea plant with genotype $$Tt ($$tall) is crossed with another $$Tt$$ plant. What is the probability that an offspring will be homozygous recessive (dwarf)?

Accepted Answer

$$\frac{1}{4}$$

Question 5

Which of the following statements about Mendel’s experiments is FALSE?

Accepted Answer

He allowed random fertilization to occur in his crosses.

Question 6

If the blending theory of inheritance were correct, what would you expect to see in the F1 generation when crossing a pure-breeding purple-flowered pea plant with a pure-breeding white-flowered pea plant?

Accepted Answer

All F1 plants would have light purple flowers.

Question 7

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

Accepted Answer

Homozygous dominant

Question 8

Which of the following best defines the term 'phenotype'?

Accepted Answer

The observable physical or physiological traits of an organism

Question 9

A dog breeder wants to ensure that all puppies in a litter will have a specific coat color, which is a dominant trait. What breeding strategy should the breeder use?

Accepted Answer

Cross two homozygous dominant dogs for the trait

Question 10

Which of the following is an example of a dichotomous trait as used by Mendel in his experiments?

Accepted Answer

Flower color that is either purple or white

Question 11

In a real-world scenario, a genetic counselor is explaining to a couple that each of them carries one allele for cystic fibrosis (a recessive disorder). What is the probability that their child will have cystic fibrosis?

Accepted Answer

$$\frac{1}{4}$$

Question 12

Which of the following best describes the difference between homozygous and heterozygous genotypes?

Accepted Answer

Homozygous means having two identical alleles; heterozygous means having two different alleles.

Question 13

A plant with genotype $$Rr ($$round seeds) is self-fertilized. What is the expected phenotypic ratio of round to wrinkled seeds in the F2 generation?

Accepted Answer

$$3:1$$

Question 14

Which of the following is NOT a key to Mendel’s experimental success?

Accepted Answer

Use of traits with continuous variation

Question 15

A geneticist is studying a trait controlled by a single gene with two alleles. If the trait shows a 3:1 phenotypic ratio in the F2 generation, what can be inferred about the alleles?

Accepted Answer

One allele is dominant and the other is recessive

Question 16

Which of the following best explains why Mendel’s work disproved the blending theory of inheritance?

Accepted Answer

Recessive traits reappeared unchanged in the F2 generation

Question 17

In a real-world agricultural scenario, a farmer wants to produce only yellow-seeded pea plants (yellow is dominant to green). If the farmer crosses two heterozygous yellow-seeded plants, what percentage of the offspring will have green seeds?

Accepted Answer

25%

Question 18

Which of the following is an example of the Principle of Independent Segregation?

Accepted Answer

A plant with genotype $$Tt$$ produces gametes with either $$T or$$ $$t$$ alleles.

Transmission Genetics: Mendelian Principles and Monohybrid Crosses

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