BIOLOGY NOW (LL)-W/CARROLL:STORY...
BIOLOGY NOW (LL)-W/CARROLL:STORY...
2nd Edition
ISBN: 9780393426076
Author: HOUTMAN
Publisher: NORTON
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Chapter 12, Problem 1TQ
Summary Introduction

The evolution is the alteration in the heritable features of the biological population over a successive generation. The evolution on a small scale (microevolution) is referring to the alteration in allele frequencies within a population. The allele frequencies may alter due to the four fundamental forces of evolution, namely mutations, natural selection, genetic drift and gene flow.

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Answer to Problem 1TQ

The founder effect is a type of genetic drift in which individuals in one small group of a large population establish a new distant population and then reproduce.

Explanation of Solution

The founder effect is a special type of genetic drift. It occurs when a small group present in the population splinters off from the original population and establish a new one. Thus, the founder effect takes place when some individuals of large population form a new distant population at diverse place and reproduce. The genetic drift is the variation in the frequency of an existing gene variant found in a population due to random sampling of an organism.

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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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