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Chapter 14 Digging Deeper: Conceptual Learning Activity Back to Assignment Attempts 1. Tracing human genetics through pedigrees Gregor Mendel was able to selectively breed hundreds of pea plants to understand how traits were passed through generations. Studying human traits is not as easy, since humans generally choose their own mates to breed with and have only a few offspring. Frequently, the appearance of human traits is studied through the use of pedigrees, which are like family trees that record the presence of a specific trait throughout a family's history. I The following pedigree traces the inheritance of a certain genetic disease in a family. The arcles represent women and the squares represent men. Individuals with darkened shapes have the disease, while individuals with white shapes do not. The lines indicate the relationship between individuals, either through marriage or by birth. Study the chart and then answer the questions that follow. II III Average/4 How many generations are shown in this pedigree? O Three Four B O X
Chapter 14 Digging Deeper: Conceptual Learning Activity I II III How many generations are shown in this pedigree? O Three O Four O Five How many men have the disease in this pedigree? Three Six O One O One of the people on the chart is labeled with the letter A. Which of the following statements correctly describes this person's status in the pedigree? O This person does not have the disease, but this person's father and one of this person's sisters do. O This person does not have the disease, but this person married someone with the disease, and one of the couple's daughters has
Chapter 14 Digging Deeper: Conceptual Learning Activity 3 One of the people on the chart is labeled with the letter A. Which of the following statements correctly describes this person's status in the pedigree? O This person does not have the disease, but this person's father and one of this person's sisters do. This person does not have the disease, but this person married someone with the disease, and one of the couple's daughters has the disease as well. O This person does not have the disease, but this person's father and one of this person's brothers do. Geneticists study pedigrees to look for patterns in how traits are passed on. This helps them learn more about a trait, such as whether it is inherited in a dominant or recessive manner. Examine the smaller pedigree shown here. Based on this pedigree, does this trait appear to be dominant or recessive? O Dominant O Recessive Grade It Now W Save & Continue