The differences in behavior of sex-linked gene and autosomal gene in genetic crosses. Introduction: Sex-linked genes are basically different from autosomes thereby, their inheritance pattern also differs. The genes are present on sex chromosomes, which determine the sex of progeny. Few genes, for example, the eye color in Drosophila is linked to X chromosome and therefore, shows the sex-linked inheritance.

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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 12.4, Problem 4R

Summary Introduction

To review:

The differences in behavior of sex-linked gene and autosomal gene in genetic crosses.

Introduction:

Sex-linked genes are basically different from autosomes thereby, their inheritance pattern also differs. The genes are present on sex chromosomes, which determine the sex of progeny. Few genes, for example, the eye color in Drosophila is linked to X chromosome and therefore, shows the sex-linked inheritance.

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Female flies with white eyes and miniature wings (both X-linkedrecessive traits) were crossed to male flies with red eyes and longwings. On rare occasions, female offspring were produced withwhite eyes. If we assume these females are due to errors in meiosis, what would be the most likely chromosomal composition ofsuch flies? What would be their wing length?

An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B • C D E F G A B • C D V W X R S • T U E F G R S • T U V W X Q. Draw the pairing arrangement of these chromosomes in prophase I of meiosis.

Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a specific locus in the X chromosome. The gene in question codes for a transcription factor involved in digit development. The mutant allele is dominant and gives rise to an additional but non-functioning little finger (polydactyly) on both hands. A couple have had their DNA sequenced at the region of interest, the male exhibits polydactyly because of the mutation, the female is homozygous wild type at the same locus and therefore has the wild type phenotype. Both have green eyes. In this story; eye colour shows a monogenic autosomal inheritance pattern and the allele for brown eyes shows incomplete dominance with that for blue eyes, the heterozygote phenotype is green eyes. The genes for eye colour and polydactyly show no linkage.

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 12.4, Problem 4R

Summary Introduction

To review:

The differences in behavior of sex-linked gene and autosomal gene in genetic crosses.

Introduction:

Sex-linked genes are basically different from autosomes thereby, their inheritance pattern also differs. The genes are present on sex chromosomes, which determine the sex of progeny. Few genes, for example, the eye color in Drosophila is linked to X chromosome and therefore, shows the sex-linked inheritance.

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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 12.4, Problem 4R

Summary Introduction

To review:

The differences in behavior of sex-linked gene and autosomal gene in genetic crosses.

Introduction:

Sex-linked genes are basically different from autosomes thereby, their inheritance pattern also differs. The genes are present on sex chromosomes, which determine the sex of progeny. Few genes, for example, the eye color in Drosophila is linked to X chromosome and therefore, shows the sex-linked inheritance.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

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 12.4, Problem 4R

Summary Introduction