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When the human genome sequence was finally completed, scientists were surprised to discover that the genome contains far fewer genes than expected. How many genes are present in the human genome? Scientists have also found that there are many more different kinds of proteins in human cells than there are different genes in the genome. How can this be explained?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 15, Problem 11QP
Textbook Problem
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When the human genome sequence was finally completed, scientists were surprised to discover that the genome contains far fewer genes than expected. How many genes are present in the human genome? Scientists have also found that there are many more different kinds of proteins in human cells than there are different genes in the genome. How can this be explained?

Summary Introduction

To determine: The total number of genes present in the human genome.

Introduction: Human genome is large and contains over 3 billion nucleotides of DNA. Scientists analyze the genomic information with bioinformatics. It is estimated that the finished human genome sequence is 99.99% accurate.

Explanation of Solution

Scientists predicted a total number of genes in the human genome to be 80,000 to 100,000. The total number of discovered genes in the human genome is approximately 20,000 to 25,000 which is far fewer than the predicted number...

Summary Introduction

To determine: The reason behind the presence of more different kinds of proteins in human cells than there are genes.

Introduction: The portion of the human genome that encodes protein is defined as a gene. The human genome contains 20,000 to 25,000 genes which can produce several hundred thousand different proteins.

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