The Mendel's first law of inheritance. Introduction: The first law of Mendel is known as the law of dominance. This law explains that each gene has two alleles that code for a specific trait. One of the alleles is always dominant, which means that it will always show, while the other allele is recessive meaning its presence can be masked by the dominant allele.

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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 2, Problem 6P

Summary Introduction

To explain: The Mendel's first law of inheritance.

Introduction: The first law of Mendel is known as the law of dominance. This law explains that each gene has two alleles that code for a specific trait. One of the alleles is always dominant, which means that it will always show, while the other allele is recessive meaning its presence can be masked by the dominant allele.

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A woman with fair skin, blond hair, and blue eyes gives birth to fraternal twins; the father has dark brown skin, dark hair, and brown eyes. One twin has blond hair, brown eyes, and light skin, and the other has dark hair, brown eyes, and dark skin. What Mendelian law does this real-life case illustrate and explain what this means in terms of the inherited alleles for these genes?

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Mendel's concept of dominance states that in a genotype where two different alleles of a locus are present, only the trait encoded by the dominant allele is observed. Give a molecular explanation for dominance, i.e. explain intracellular molecular events that can result in what we observe as dominance on a phenotypic level. Use the gene that encodes seed shape in peas as an example, where roun(R) is dominant over wrinkled(r), to explain how RR and Rr plants can have the same phenotype.

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 2, Problem 6P

Summary Introduction

To explain: The Mendel's first law of inheritance.

Introduction: The first law of Mendel is known as the law of dominance. This law explains that each gene has two alleles that code for a specific trait. One of the alleles is always dominant, which means that it will always show, while the other allele is recessive meaning its presence can be masked by the dominant allele.

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Answer 3

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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 2, Problem 6P

Summary Introduction

To explain: The Mendel's first law of inheritance.

Introduction: The first law of Mendel is known as the law of dominance. This law explains that each gene has two alleles that code for a specific trait. One of the alleles is always dominant, which means that it will always show, while the other allele is recessive meaning its presence can be masked by the dominant allele.

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Check out a sample textbook solution

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Answer 4

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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 2, Problem 6P

Summary Introduction