TAILIEUCHUNG - Ebook Like science: Continuing the Species

(BQ) Ebook Like science: Continuing the Species includes of what is the difference between a gene and an allele? How does a mutation cause a new trait? How are monozygotic and dizygotic twins different? Sequence What is the sequence of steps taken by people who wish to breed a new type of organism with certain traits?. | Genre Comprehension Skill Text Features Science Content Nonfiction Sequence Captions Reproduction Maps Glossary I PEARSON I Scott Foresman by Beth Parlikar Vocabulary Extended Vocabulary asexual reproduction egg cell fertilization allele dizygotic genome gene heredity meiosis selective breeding sexual reproduction sperm cell molecule monozygotic propagate protein replication somatic cell Picture Credits Every effort has been made to secure permission and provide appropriate credit for photographic material. The publisher deeply regrets any omission and pledges to correct errors called to its attention in subsequent editions. Photo locators denoted as follows Top T Center C Bottom B Left L Right R Background Bkgd . Scott Foresman Dorling Kindersley would like to thank 7 TR NASA. Unless otherwise acknowledged all photographs are the copyright of Dorling Kindersley a division of Pearson. ISBN 0-328-13978-5 Copyright Pearson Education Inc. All Rights Reserved. Printed in the United States of America. This publication is protected by Copyright and permission should be obtained from the publisher prior to any prohibited reproduction storage in a retrieval system or transmission in any form by any means electronic mechanical photocopying recording or likewise. For information regarding permission s write to Permissions Department Scott Foresman 1900 East Lake Avenue Glenview Illinois 60025. 3456789 10 V010 13 12 11 10 09 08 07 06 05 I PEARSON 1 What You Already Know All organisms inherit many of their traits from their parents in a process called heredity. The instructions for making an organism are found in its DNA. DNA forms long strands called chromosomes in every cell. Each species has a certain number of chromosomes. Chromosomes are divided up into sections called genes. Each gene gives the instructions for making a molecule that contributes to a trait. DNA looks like a twisted ladder with rungs made up of materials called bases. The bases come in .

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