BIOLOGY
BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 25.4, Problem 1LO
Summary Introduction

To explain: The relationship between glaciations and CO2.

Introduction: To explore the diversification and origins of life over several billions of years ago, it is essential to understand the deep, or geological, time. Geological time is ordered into four eons, namely Hadean, Archean, Proterozoic, and Phanerozoic eons. These eons stretch over 4.6 billion years. Eons are subdivided into various eras including Paleozoic, Mesozoic, and Cenozoic eras. The eras are further divided into various periods, including Cambrian, Permian, Triassic, Jurassic, and Cretaceous periods.

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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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