Chapter 5 The Selection

Chapter 5 The Selection Chapter 5 The Selection Mrs. Jean carefully read the interview questions and then scanned the responses. "First of all," she began, "let's talk about each of your questions. Your first question is about hair, and it's true that hair color and type is something passed down through your genes." "Jeans, like blue jeans?" asked Heather. "Actually, I meant genes, spelled G-E-N-E-S, which are units of heredity that transfer traits like hair and eye color from one generation

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Chapter 5 The Selection



Chapter 5 The Selection

Mrs. Jean carefully read the interview questions and then scanned the responses."First of all," she began, "let's talk about each of your questions.Your first question is about hair, and it's true that hair color and type is something passed down through your genes."

"Jeans, like blue jeans?" asked Heather.

"Actually, I meant genes, spelled G-E-N-E-S,which are units of heredity that transfer traits like hair and eye color from one generation to the next," Mrs. Jean explained.

"Human genes are found in pairs, and you get one from your mother and one from your father.Genes can either be dominant or recessive,which means that a dominant gene will always override a recessive gene.For example, with hair, the genes for brown hair and curly hair are dominant,while the genes for blond hair and straight hair are recessive."

"So that means my twin has to have curly brown hair, like I do," said Heather.

"Not necessarily. Your parents may have each carried the recessive gene.Also, hair is something you can change by bleaching blond or straightening.So I would say that you can't really use hair type to indicate heredityunless you know for certain that the person has not changed his or her hair in any way."

"I guess we don't know whether or not any of our finalists changed their hair," said Mrs. Alto.

"Now, about eye color; the brown-eye gene is dominant while the blue-eye gene is recessive,so eye color used to be a very good indicator of heredity.But nowadays, people can wear colored contact lenses and change the color of their eyes."

"I suppose you're right," said Heather, trying not to sound disappointed.

"And three of these other questions about liking chess, cats, and peanut butter all deal with acquired traits,which means they're all things you can learn to like or not like.You aren't necessarily born liking chess, cats, or peanut butter,so I'm afraid these questions will not help you find your twin."

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