Question 1

In Mendel's experiments with pea plants, what does it mean for a plant to be 'true-breeding' for a particular trait?

Accepted Answer

It produces offspring identical to itself for that trait when self-fertilized.

Question 2

Which of the following best describes the Law of Segregation as proposed by Mendel?

Accepted Answer

Each individual has two alleles for each gene, and these alleles separate during gamete formation.

Question 3

If a white-flowered pea plant (pp) is crossed with a homozygous purple-flowered plant (PP), what is the expected phenotype ratio of the offspring?

Accepted Answer

All purple

Question 4

In a monohybrid cross between two heterozygous pea plants (Pp x Pp), what is the expected genotype ratio among the offspring?

Accepted Answer

$$1\ PP : 2\ Pp : 1\ pp$$

Question 5

What is the purpose of a test cross in genetics?

Accepted Answer

To determine whether an individual with a dominant phenotype is homozygous or heterozygous

Question 6

How many different types of gametes can be produced by an individual with the genotype AaBb?

Accepted Answer

4

Question 7

In a dihybrid cross between two individuals with genotype YyRr, what is the expected phenotype ratio among the offspring?

Accepted Answer

$$9\ :\ 3\ :\ 3\ :\ 1$$

Question 8

Which phase of meiosis is most closely associated with Mendel's Law of Independent Assortment?

Accepted Answer

Metaphase I

Question 9

If two parents are both hybrid for two characters (AaBb x AaBb), how many different phenotypes are expected in the offspring?

Accepted Answer

4

Question 10

A pedigree shows a trait that skips generations and appears only in individuals with two unaffected parents. What is the most likely mode of inheritance?

Accepted Answer

Autosomal recessive

Question 11

In the first pedigree image provided, what is the most likely pattern of inheritance for the trait shown?

Accepted Answer

Autosomal recessive

Question 12

In the second pedigree image, if individual 1 is affected by a dominant trait, what is their genotype?

Accepted Answer

Heterozygous

Question 13

Which of the following is an example of incomplete dominance?

Accepted Answer

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

Question 14

Which of the following best describes codominance?

Accepted Answer

Both alleles are expressed equally in the phenotype.

Question 15

A plant with genotype YyRr is crossed with a plant with genotype YyRR. What is the probability of producing an offspring with genotype yyRR?

Accepted Answer

$$\frac{1}{8}$$

Question 16

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affects both eye color and height.

Question 17

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute to a single trait.

Question 18

If a pedigree shows affected individuals in every generation, what is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 19

Which of the following best explains the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the observable trait.

Question 20

Which of the following is NOT a possible gamete from a parent with genotype AaBb?

Accepted Answer

AA

Patterns of Inheritance: Mendelian Genetics, Probability, and Pedigree Analysis

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