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Name Date Period What Does a Geneticist Do By Cindy Grigg Scientists who study genetics study genes and heredity how certain characteristics are inherited by offspring because their parents had these characteristics. Do you have the same eye color as your mother or father Do twins run in your family These characteristics or traits are inherited* They are passed from your parents to you by genes. Genes contain DNA that occupies a specific place on a chromosome. DNA determines a specific trait in the organism* Even the fact that you were born a boy or a girl was determined by genes. DNA is found in the nucleus of each cell* When a baby is made one cell from the father joins with one cell from the mother. This tiny cell contains all the information stored in DNA to make a new person - you If you are a boy you were given DNA from your father containing a y chromosome. If you are a girl you were given DNA from your father containing an x chromosome. Your mother could only give you an x chromosome. Girls have two x chromosomes and boys have an x and a y chromosome. The information in the DNA you inherited from your parents also determined what color of eyes you would have the color of your hair the type of ear lobes you have and whether or not you can roll your tongue. The first geneticist was Gregor Mendel* In 1865 he published a paper describing experiments he did with garden peas. He noticed that certain traits in the parent plants could be predicted to occur in a certain percentage of the offspring. Traits like plant height blossom color color of peas and whether the peas were wrinkled or smooth appeared to be passed down from the parent plant to the offspring. Mendel did not know about DNA or chromosomes and he could not explain how these traits were passed down* His work was mostly ignored for many years. Only recently did scientists finish mapping the human genome. This map shows all the genes in human DNA. Scientists believe this will help them understand many inherited diseases and could lead to the treatment and prevention of these diseases. This work is what a geneticist does. Many geneticists are doctors who treat and counsel patients who have a genetic disease. Some examples of these inherited diseases are Down s syndrome Huntington s disease sickle-cell anemia muscular dystrophy and cystic fibrosis. Genetics is a very new career choice. Could it be the career for you Copyright 2007 edHelper 1. What do geneticists study Genes and heredity Old people Plants Babies 2. What determines a specific trait Luck DNA 3. Where is DNA found In the mitochondria In the cell wall In the cytoplasm In the nucleus of a cell 4. If you are a boy what kind of chromosome did you get from your father An x chromosome 5. Girls have two chromosomes. XY Y X 6. Who was the first geneticist Charles Darwin Albert Einstein Gregor Mendel Galileo 7. The first experiments on heredity used what kind of plants Green beans Corn Sunflowers Peas 8. Do you have the same eye color as your mother or father Do twins run in your family These characteristics or traits are inherited* They are passed from your parents to you by genes. Genes contain DNA that occupies a specific place on a chromosome. DNA determines a specific trait in the organism* Even the fact that you were born a boy or a girl was determined by genes.

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