Genetics: A Conceptual Approach 6E w/ SaplingPlus (Six-Month Access)
Genetics: A Conceptual Approach 6E w/ SaplingPlus (Six-Month Access)
6th Edition
ISBN: 9781319125929
Author: Benjamin A. Pierce
Publisher: W. H. Freeman
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Chapter 7.3, Problem 34AQP
Summary Introduction

To determine:

The phenotype and proportion of the progeny if 4,000 progeny are produced in the test cross.

Introduction:

Test cross is the genetic cross between an individual that has dominant phenotype in specific trait to homozygous recessive for these specific traits. Sepia eyes, spineless bristle, and striped body these three alleles are recessive in Drosophila found on chromosome 3.

A cross is done between a fly homozygous for the alleles encoding sepia eyes, spineless bristle, and striped with a fly homozygous for the wild type alleles codes for sepia eyes, spineless bristle, and striped body. Interference among the genes is given as 0.2. The female progeny are test crossed with male that have sepia eyes, normal bristles and striped body.

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*Example 2: Tracing the path of an autosomal dominant trait Trait: Neurofibromatosis Forms of the trait: The dominant form is neurofibromatosis, caused by the production of an abnormal form of the protein neurofibromin. Affected individuals show spots of abnormal skin pigmentation and non-cancerous tumors that can interfere with the nervous system and cause blindness. Some tumors can convert to a cancerous form. i The recessive form is a normal protein - in other words, no neurofibromatosis.moovi A typical pedigree for a family that carries neurofibromatosis is shown below. Note that carriers are not indicated with half-colored shapes in this chart. Use the letter "N" to indicate the dominant neurofibromatosis allele, and the letter "n" for the normal allele. Nn nn nn 2 nn Nn A 3 N-
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