The results produced in the given first cross. Introduction: According to Mendelian inheritance , a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

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Answer 1

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Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

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In a dihybrid cross, a true breeding short white flowered plant is crossed with a non-true breeding tall purple flowered plant. Both tall and purple are dominant traits. What are the genotypes and phenotypes of the offspring generation and what are the ratios of each?

A tall pea plant (homozygous dominant) is crossed to a pea plant that is heterozygous for the gene for height. Create a Punnett Square and use it to answer the following questions: What is the genotypic ratio of the offspring? What is the phenotypic ratio of the offspring? Answers are written as genotype; phenotype a) 50% TT : 50% Tt; 100% tall plants b) 1 TT : 2 Tt : 1tt; 75% tall plants : 25% dwarf plants c) 1 TT : 2 Tt : 1tt; 25% tall plants : 50% medium height plants : 25% dwarf plants

In a cross between a black and a white cat, all members of the Fi generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white cat. (i) Diagram this cross, showing the genotypes and phenotypes of the parents, F, and F2 generations. What is the probability that the first two offspring will be homozygous and the third is white if an Ficat is test crossed?

Answer 2

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Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

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Answer 3

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

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Answer 4

Question

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

Expert Solution & Answer

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Answer 5

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

Answer 6

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Answer 7

Chapter 14, Problem 8GP

Summary Introduction

To explain: The results produced in the given first cross.

Introduction: According to Mendelian inheritance, a single character is controlled by one or more pairs of alleles. These alleles can be either dominant or recessive. Usually, a dominant allele masks the expression of a recessive allele. A recessive allele is expressed only in homozygous condition, but a dominant allele is expressed both in homozygous and heterozygous condition.

Answer 8

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

Answer 9

Summary Introduction

To explain: The unusual ratio that has occurred in the second generation.

Introduction: In some organisms, presence of certain genes leads to the death of the organism. Those genes are known as “Lethals” or lethal genes. They can be dominant or recessive. However, recessive alleles are common, whereas the dominant alleles are rare. This is because it is impossible to mask the harmful allele in a heterozygous condition. Lethal alleles cause death before the organism can reproduce. Tay-Sach’s disease is an example of lethal disorder in humans.

Answer 10

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Answer 13

Ch. 14 - Fill in the following diagram of a cross of...Ch. 14 - A tall pea plant is crossed with a recessive dwarf...Ch. 14 - A true-breeding tall, purple-flowered pea plant...Ch. 14 - a. In the following cross, what is the probability...Ch. 14 - Prob. 5IQ Ch. 14 - Consider an example in which the M/m gene (for...Ch. 14 - The height of spike weed is a result of polygenic...Ch. 14 - Consider the following pedigree for the trait...Ch. 14 - a. What is the probability that a mating between...Ch. 14 - If two prospective parents both have siblings who...

Solution Summary: The author explains that a single character is controlled by one or more pairs of alleles, which can be either dominant or recessive.

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