Question 1

Which of the following characteristics made pea plants an ideal model organism for Mendel's genetic experiments?

Accepted Answer

They have easily observable traits and can self-fertilize or be cross-fertilized.

Question 2

In Mendel's experiments, what is the genotype of a pea plant that is homozygous for yellow seed color?

Accepted Answer

$$YY$$

Question 3

If two heterozygous yellow-seeded pea plants ($$Yy) $$are crossed, what is the expected phenotypic ratio of yellow to green seeds in the offspring?

Accepted Answer

$$3:1$$

Question 4

Which law states that alleles for different traits segregate independently during gamete formation?

Accepted Answer

Law of Independent Assortment

Question 5

A dihybrid cross between $$RrYy$$ and $$RrYy$$ pea plants produces offspring with which phenotypic ratio?

Accepted Answer

$$9:3:3:1$$

Question 6

What is the probability that two heterozygous parents ($$Yy) $$will have three offspring, all of which are homozygous recessive ($$yy$$)?

Accepted Answer

$$1/64$$

Question 7

Which of the following is an example of incomplete dominance?

Accepted Answer

A cross between red and white flowers producing pink flowers.

Question 8

In a pedigree chart, what does a shaded square represent?

Accepted Answer

An affected male

Question 9

Which of the following statements about X-linked recessive inheritance is correct?

Accepted Answer

Males only need one copy of the recessive allele to express the trait.

Question 10

A woman with type AB blood and a man with type O blood have a child. What are the possible blood types of their child?

Accepted Answer

Type A or Type B

Question 11

Which of the following is a consequence of independent assortment?

Accepted Answer

Gametes can have new combinations of alleles not found in either parent.

Question 12

What is the expected fraction of offspring that will be homozygous recessive for both traits in a dihybrid cross of $$AaBb 	imes AaBb$$?

Accepted Answer

$$1/16$$

Question 13

Which of the following best describes pleiotropy?

Accepted Answer

One gene affects multiple traits.

Question 14

A pedigree chart shows a genetic disorder in every generation and affects both males and females equally. What is the most likely inheritance pattern?

Accepted Answer

Autosomal dominant

Question 15

Which of the following is an example of a multifactorial character?

Accepted Answer

Human height influenced by multiple genes and environmental factors.

Question 16

What is the probability that a child will inherit the same genotype as either parent if one parent is homozygous dominant ($$AA) $$and the other is heterozygous ($$Aa$$)?

Accepted Answer

$$1/2$$

Question 17

Which of the following statements about epistasis is correct?

Accepted Answer

One gene affects the expression of another gene.

Question 18

In a test cross, if all offspring display the dominant phenotype, what is the genotype of the mystery parent?

Accepted Answer

Homozygous dominant

Question 19

Which phase of meiosis is responsible for Mendel's observation of the segregation of alleles?

Accepted Answer

Anaphase I

Question 20

A female cat is heterozygous for two X-linked genes, one for black fur and one for orange fur. What is the expected fur color pattern in her offspring?

Accepted Answer

Calico (patches of black and orange)

Patterns of Inheritance: Mendelian Genetics and Beyond

Study Guide - Practice Questions

Study Guide - Flashcards