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Let’s Practice Autosome Trait for Hemoglobin • Alleles: • Normal Hemoglobin (Dominant) (H) • Sickle Cell Hemoglobin (recessive) (hs) A woman has a sister who has sickle cell anemia. The woman decides to have genetic testing before she and her husband, who carries the sickle cell allele, have a child. She wants to know what the chances of having a baby with sickle cell anemia would be. ♂ Key Normal Carrier Disease Sickle Cell Hemoglobin ♀ Sickle Cell Anemia Punnett Square Probability Problem ♂ ♀ H hs ♂ ♀ H H H hs H hs Let’s Practice Sex Linked Trait for Red/Green Color Blindness • Alleles: • Normal Red/Green Sight (Dominant) (XC) • Red/Green Color Blindness (recessive) (Xc) A couple request genetic testing because the husband is color blind and the wife has normal vision but has a grandfather who is color blind. They are worried about passing Red/Green Color Blindness onto their children. ♂ Key ♀ Normal Carrier Disease Red/Green Color Blindness Red-Green Color Blindness Punnett Square Probability Problem ♂ Xc y ♂ ♀ c X y ♀ XC XC Xc XC