Question 1

What is the term for an observable trait of an organism?

Accepted Answer

A) element 
B) phenotype 
C) hybrid 
D) genotype 
E) allele 
A) element 
B) phenotype 
C) hybrid 
D) genotype 
E) allele B

Question 2

What is the difference between a monohybrid and a dihybrid cross?

Accepted Answer

A monohybrid cross follows one trait,and a dihybrid cross follows two traits.

Question 3

The D gene controls pea plant height.The DD and dd genotypes confer tall and dwarf phenotypes,respectively.What is the relationship between D and d?

Accepted Answer

A) They are two different plant chromosomes. 
B) They are two different genes on the same chromosome. 
C) They are alleles of the same gene. 
D) They are two possible homozygous genotypes. 
E) They are two possible heterozygous genotypes. 
A) They are two different plant chromosomes. 
B) They are two different genes on the same chromosome. 
C) They are alleles of the same gene. 
D) They are two possible homozygous genotypes. 
E) They are two possible heterozygous genotypes. C

Question 4

List two characteristics of the garden pea plant,Pisum sativum,that make it an ideal organism for genetic experiments.

Accepted Answer

It can be self-fertilized or cross-ferti

Question 5

Crossing two pink snapdragons yields some seeds that produce red-flowering plants,some seeds that produce white-flowering plants and some seeds that produce pink-flowering plants.If this trait operates by incomplete dominance and the allele R represents red flowers and the allele r represents white flowers,what genotype would a plant with pink flowers have for this trait?

Accepted Answer

A) RR 
B) Rr 
C) rr 
D) RrRr 
A) RR 
B) Rr 
C) rr 
D) RrRr

Question 6

A,B,and O blood type in humans is controlled by a single gene with three alleles: Iᴬ,Iᴮ,and i.Type O is the recessive trait.The i allele is recessive to both Iᴬ and Iᴮ.Which of the following could be possible genotypes of the parents of a person with type O blood?

Accepted Answer

A) Iᴬᴵᴮ and ii 
B) Iᴬᶦ and Iᴬᴵᴬ 
C) Iᴬᶦ and Iᴮᶦ 
D) Iᴬᴵᴮ and Iᴬᴵᴮ 
A) Iᴬᴵᴮ and ii 
B) Iᴬᶦ and Iᴬᴵᴬ 
C) Iᴬᶦ and Iᴮᶦ 
D) Iᴬᴵᴮ and Iᴬᴵᴮ

Question 7

Which type of inheritance is most likely to display a bell curve of phenotypes?

Accepted Answer

A) codominance 
B) multiple alleles 
C) polygenic inheritance 
D) monohybrid cross 
E) incomplete dominance 
A) codominance 
B) multiple alleles 
C) polygenic inheritance 
D) monohybrid cross 
E) incomplete dominance

Question 8

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.A true-breeding plant with green seeds and white flowers is crossed to a plant that is heterozygous for the genes for both phenotypes.What is the probability that the cross will yield a plant with green seeds and white flowers?

Accepted Answer

A) 3/16 
B) 3/32 
C) 1/32 
D) 1/16 
E) 1/4 
A) 3/16 
B) 3/32 
C) 1/32 
D) 1/16 
E) 1/4

Question 9

A man with type O blood has a sister with type AB blood.What are the genotypes and phenotypes of their parents?

Accepted Answer

One of the parents is heterozy

Question 10

In the Law of ________,Mendel stated that two genetic elements are separated in gamete formation.

Accepted Answer

The answer of In the Law of ________,Mendel stated that...

Question 11

When a yellow-seeded pea plant with the genotype Yy produces gametes,what will be the genotype(s)of the gametes?

Accepted Answer

A) All will be YY. 
B) All will be Yy. 
C) They will be either all Y or all y. 
D) Half will be YY, and half will be yy. 
E) Half will be Y, and half will be y. 
A) All will be YY. 
B) All will be Yy. 
C) They will be either all Y or all y. 
D) Half will be YY, and half will be yy. 
E) Half will be Y, and half will be y.

Question 12

If a person has a recessive trait,the genotype must be homozygous recessive for the trait.

Accepted Answer

A) True 
 B)False

Question 13

What is the basis for incomplete dominance?

Accepted Answer

A) Both alleles of a gene produce weakly functioning proteins. 
B) One allele produces some functioning protein; the other allele is nonfunctional. 
C) Crossing over has switched alleles for a gene on homologous chromosomes. 
D) One gene has many effects. 
E) An individual has more than two alleles for a gene. 
A) Both alleles of a gene produce weakly functioning proteins. 
B) One allele produces some functioning protein; the other allele is nonfunctional. 
C) Crossing over has switched alleles for a gene on homologous chromosomes. 
D) One gene has many effects. 
E) An individual has more than two alleles for a gene.

Question 14

The genotype Ff is an example of a:

Accepted Answer

A) trait controlled by multiple genes. 
B) homozygous genotype. 
C) monohybrid genotype. 
D) heterozygous genotype. 
E) dihybrid genotype. 
A) trait controlled by multiple genes. 
B) homozygous genotype. 
C) monohybrid genotype. 
D) heterozygous genotype. 
E) dihybrid genotype.

Question 15

Before Mendel,people had observed inheritance of dominant and recessive traits by following many generations of plants and animals.What was different about Mendel's work?

Accepted Answer

A) He used a plant that had never been cultivated before. 
B) He kept careful count of his results, including mathematical analysis. 
C) His results were immediately accepted and applied to other studies. 
D) He followed more generations than anyone else. 
E) He did both cross- and self-fertilizations. 
A) He used a plant that had never been cultivated before. 
B) He kept careful count of his results, including mathematical analysis. 
C) His results were immediately accepted and applied to other studies. 
D) He followed more generations than anyone else. 
E) He did both cross- and self-fertilizations.

Question 16

Dimpled cheeks are dominant to undimpled cheeks.If there exists a 50 percent chance that a child will have dimpled cheeks,the parental genotypes must be:

Accepted Answer

A) dd and dd. 
B) Dd and dd. 
C) DD and Dd. 
D) Dd and Dd. 
E) DD and dd. 
A) dd and dd. 
B) Dd and dd. 
C) DD and Dd. 
D) Dd and Dd. 
E) DD and dd.

Question 17

Cystic fibrosis (CF)is caused by a recessive allele.A child has CF,even though neither of his parents has CF.Which of the following describes the genotypes of the parents?

Accepted Answer

A) One is homozygous dominant for the CF gene, and the other is heterozygous. 
B) One is homozygous recessive for the CF gene, and the other is heterozygous. 
C) They are both homozygous recessive for the CF gene. 
D) They are both homozygous dominant for the CF gene. 
E) They are both heterozygous for the CF gene. 
A) One is homozygous dominant for the CF gene, and the other is heterozygous. 
B) One is homozygous recessive for the CF gene, and the other is heterozygous. 
C) They are both homozygous recessive for the CF gene. 
D) They are both homozygous dominant for the CF gene. 
E) They are both heterozygous for the CF gene.

Question 18

A true-breeding strain of red tulips is crossed to a true-breeding strain of white tulips.All the offspring have pink flowers.When a pink-flowered plant is self-fertilized,the offspring have red,pink,and white flowers,in the ratio 1:2:1.This type of inheritance is an example of ________.

Accepted Answer

incomplete

Question 19

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape,he saw a 9:3:3:1 ratio in the next generation.Explain what this ratio describes and what each number represents.

Accepted Answer

It is the ratio of offspring with the fo

Question 20

Mendel wanted to make sure his starting plants bred true,meaning the:

Accepted Answer

A) seeds would always sprout. 
B) peas would always be green. 
C) phenotypes of the offspring in each generation could not be predictable. 
D) phenotypes of the offspring in each generation were always the same as the parent. 
E) phenotypes of the offspring in each generation would sometimes look like the male parent and sometimes look like the female parent. 
A) seeds would always sprout. 
B) peas would always be green. 
C) phenotypes of the offspring in each generation could not be predictable. 
D) phenotypes of the offspring in each generation were always the same as the parent. 
E) phenotypes of the offspring in each generation would sometimes look like the male parent and sometimes look like the female parent.

Exam 11: The First Geneticist: Mendel and His Discoveries

What is the term for an observable trait of an organism?

What is the difference between a monohybrid and a dihybrid cross?

The D gene controls pea plant height.The DD and dd genotypes confer tall and dwarf phenotypes,respectively.What is the relationship between D and d?

List two characteristics of the garden pea plant,Pisum sativum,that make it an ideal organism for genetic experiments.

A,B,and O blood type in humans is controlled by a single gene with three alleles: Iᴬ,Iᴮ,and i.Type O is the recessive trait.The i allele is recessive to both Iᴬ and Iᴮ.Which of the following could be possible genotypes of the parents of a person with type O blood?

Which type of inheritance is most likely to display a bell curve of phenotypes?

A man with type O blood has a sister with type AB blood.What are the genotypes and phenotypes of their parents?

In the Law of ________,Mendel stated that two genetic elements are separated in gamete formation.

When a yellow-seeded pea plant with the genotype Yy produces gametes,what will be the genotype(s)of the gametes?

If a person has a recessive trait,the genotype must be homozygous recessive for the trait.

What is the basis for incomplete dominance?

The genotype Ff is an example of a:

Before Mendel,people had observed inheritance of dominant and recessive traits by following many generations of plants and animals.What was different about Mendel's work?

Dimpled cheeks are dominant to undimpled cheeks.If there exists a 50 percent chance that a child will have dimpled cheeks,the parental genotypes must be:

Cystic fibrosis (CF)is caused by a recessive allele.A child has CF,even though neither of his parents has CF.Which of the following describes the genotypes of the parents?

A true-breeding strain of red tulips is crossed to a true-breeding strain of white tulips.All the offspring have pink flowers.When a pink-flowered plant is self-fertilized,the offspring have red,pink,and white flowers,in the ratio 1:2:1.This type of inheritance is an example of ________.

When Mendel performed a dihybrid cross of plants heterozygous for seed color and seed shape,he saw a 9:3:3:1 ratio in the next generation.Explain what this ratio describes and what each number represents.

Mendel wanted to make sure his starting plants bred true,meaning the:

Science As a Way of Learning: a Guide to the Natural World

Fundamental Building Blocks: Chemistry, water, and Ph

Lifes Components: Biological Molecules

Lifes Home: the Cell

Lifes Border: the Plasma Membrane

Lifes Mainspring: an Introduction to Energy

Vital Harvest: Deriving Energy From Food

The Green Worlds Gift: Photosynthesis

The Links in Lifes Chain: Genetics and Cell Division

Preparing for Sexual Reproduction: Meiosis

Units of Heredity: Chromosomes and Inheritance

Passing on Lifes Information: Dna Structure and Replication

How Proteins Are Made: Genetic Transcription, translation, and Regulation

The Future Isnt What It Used to Be: Biotechnology

An Introduction to Evolution: Charles Darwin, evolutionary Thought, and the Evidence for Evolution

The Means of Evolution: Microevolution

The Outcomes of Evolution: Macroevolution

A Slow Unfolding: the History of Life on Earth

Arriving Late,traveling Far: the Evolution of Human Beings

Viruses,bacteria,archaea,and Protists: the Diversity of Life 1

Fungi: the Diversity of Life 2

Animals: the Diversity of Life 3

Plants: the Diversity of Life 4

The Angiosperms: Form and Function in Flowering Plants

Body Support and Movement: the Integumentary, skeletal, and Muscular Systems

Communication and Control 1: the Nervous System

Communication and Control 2: the Endocrine System

Defending the Body: the Immune System

Transport and Exchange 1: Blood and Breath

Transport and Exchange 2: Digestion, nutrition, and Elimination

An Amazingly Detailed Script: Animal Development

How the Baby Came to Be: Human Reproduction

An Interactive Living World 1: Populations in Ecology

An Interactive Living World 2: Communities in Ecology

An Interactive Living World 3: Ecosystems and Biomes

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