Biology: Concepts and Investigations
Biology: Concepts and Investigations
3rd Edition
ISBN: 9780073525549
Author: Mariëlle Hoefnagels Dr.
Publisher: McGraw-Hill Education
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Chapter 38, Problem 13WIO
Summary Introduction

To explain:

The way in which parasites can affect food webs.

Concept introduction:

Organism feed on matter, energy and one another through community from particular “trophic level”. Trophic level is a rank in the hierarchy of feeding. At each trophic level, organisms use energy such as for cellular respiration and only small portion of the energy is transferred to next level. Producers occupy first trophic level while consumers (primary) occupy second trophic level. The third trophic level is occupied by consumers that prey on primary consumers.

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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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Chapter 38 Solutions

Biology: Concepts and Investigations

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