HUMAN BIOLOGY (LOOSELEAF)-W/CONNECT
HUMAN BIOLOGY (LOOSELEAF)-W/CONNECT
16th Edition
ISBN: 9781260692174
Author: Mader
Publisher: MCG
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Chapter 23.2, Problem 3CYP
Summary Introduction

To determine:

The reason for natural selection being the mechanism for biological evolution.

Introduction :

The change in the heritable characteristics in a population over a period is termed as evolution. All living beings have evolved at some point in time. The given characteristics are the result of gene expressions and these genes pass on form from one generation to the next generation. Evolution is the result of variation in the genes that makes a characteristic rare or common in the population.

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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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