Who Discovered DNA?

Who Discovered DNA? book cover — Who Discovered DNA Jenny Vaughan

Who Discovered DNA? — page 1 — The secret of heredity An age-old mystery What makes us the way we are Why do some of us have dark hair and others have light hair Why do cats only have kittens and never puppies For centuries no one knew the answers to these questions It took many years of inquiry and research to understand how organisms living things inherit characteristics from their parents Two kinds of study Two different kinds of study led to this understanding One involved breeding plants and animals and noticing how living things pass their characteristics such as color size and shape to their offspring This is called heredity Another area of study looked at how organisms are constructed Scientists learned that organisms are all made up of tiny building blocks called cells The very smallest living things such as bacteria are made up of just one cell while large organisms such as humans have trillions of cells THAT’S A FACT Some bacteria are so small that a million can cover the head of a pin Sheep like other living things produce offspring like themselves The young inherit characteristics from their parents In this case young lambs like adult sheep will have four legs will eat grass and will have thick woolly coats 6

Who Discovered DNA?

Who Discovered DNA?

This series looks at some of the major inventions and discoveries that have helped shaped our world today.

About This Book

By: Jenny Vaughan

Illustrated by:

Published by: Arcturus Publishing provided by Britannica

9-12Age Range

-AR

42Pages

ScienceSubject

-Lexile

30-45 minsReading Time

-Guided Reading

-Fountas & Pinnell

-DRA

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