CHAPTER 4 – REPRODUCTION AND INHERITANCE


EXAMPLE QUESTIONS


1. Identify the parents of 5, 6 and 7. 1 and 2


2. How many children do parents 3 and 4 have? 2


3. In generation II, how many individuals have albinism? None


4. In generation III, which individuals have albinism? One, individual 11


5. Which of the following statements describes individual 7? Explain your answer. a. He does not have albinism b. He does not have albinism but is a carrier c. He has albinism


b. He does not have albinism but is a carrier. Although he does not have albinism, we know he is a carrier of the recessive gene because he has passed it on to his daughter (individual 11), who has albinism.


?


TEST TUBE


9. Cystic fibrosis (CF) is an inherited disease. It causes the body to produce a thick mucus, that damages the lungs and other organs. Examine the pattern of inheritance for cystic fibrosis shown in the pedigree chart below and answer the questions that follow.


I II 1 5 6 2 3 47 8 III 910


Male without CF Female without CF Male with CF Female with CF


11 : Fig. 4.13 A pedigree chart to represent the pattern of inheritance for cystic fibrosis


a. How many children did parents 1 and 2 have? b. Individual 6 has CF. What does this tell us about his parents, 1 and 2? c. Individuals 7 and 8 have one child. i. What number is this child?


ii. Do they have CF? Explain your answer.


Elements of Science 37


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