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Name Class _ _ Date _ Critical Thinking Diagram Worksheet 9-1 Xh XhXh Xh .....• ~ Female hemop hiliac has both recessive genes. XhV V - X XhXh Xhy XhX •••••• Xy ......•. •.... ......••. •••••• Male hemophiliac. Has gene for hemophilia. • XhX Female carrier of hemophilia trait. XV Normal male. Does not have gene for hemophilia. Figure 1 PART A Answer the questions following. 1. Explain why one of the female children in the Punnett square will be a carrier for hemophilia, the other will have hemophilia. 2. Why is it necessary for a male child to inherit only one gene for hemophilia PART B but to develop the disease? • Complete the following for Figure 2. b. a. .z----, xv Figure 2 1. What does the chromosome symbol Xh indicate? _ 2. Draw a square around each male genotype and a circle around each female genotype on the diagram. 3. Shade in half of each square or circle that indicates an individual who is a carrier of the hemophilia trait. 4. Shade in all of each square or circle that indicates an individual who has hemophilia. 5. Which males, if any, have hemophilia? _ 6. Which females, if any, have hemophilia? _ 7. Which females, if any, are carriers for hemophilia? 8. Is hemophilia a sex-limited or a sex-influenced _ trait? Explain. _ ". 12 Critical Thinking Diagram Worksheet 9- 7 © Addison-Wesley -./ Publishing Company, Inc. All Rights Reserved. • Critical Thinking Diagram 9- 1 • x xv v • XhXh XhX Female carrier of hemophilia trait. Female hemophiliac has both recessive genes. xv Male hemophiliac. Has gene for hemophilia. © Addison-Wesley Publishing Company, Inc. All Rights Reserved. Normal male. Does not have gene for hemophilia. Critical Thinking Diagram 9-1 11