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 10P

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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Mendel crossed pea plants that produced round seeds with those that produced wrinkled seeds. From a total of 7324 F2 seeds, 5474 were round and 1850 were wrinkled. Using the symbols W and w for genes, (a) symbolize the original P cross; (b) the gametes; and (c) F1 progeny, (d) Represent cross between two F1 plants (or one selfed); (e) symbolize the gametes; and (f) summarize the expected F2 results under the headings: phenotypes, genotypes, genotypic frequency, and phenotypic ratio.

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?

Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed with each other and the following progeny were produced: 320 gray and 80 white. (a) What is the most probable genotype of each parent? (b) Based on your answer in (a) above, what genotypic and phenotypic ratios are expected in the progeny?

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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 10P

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 10P

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

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 2, Problem 10P

Summary Introduction