In this chapter you read about Jenelle Stephenson, who has sickle cell disease, and Samuel Evangelista, who was diagnosed with severe combined immunodeficiency. Both Jenelle and Samuel were affected by genetic disorders caused by recessive alleles, but Samuel’s disorder was sex-linked whereas Jenelle’s was not. Match each characteristic below with the corresponding type of disorder. Note that each disorder label (sex-linked, recessive, or dominant) can match more than one target.
1. Passed down from parent to child: recessive
2. More commonly seen in males: sex-linked
3. Can skip generations: recessive
4. Can be masked by a dominant allele: recessive
5. More likely to affect individuals with two copies of the allele: recessive
6. Can be passed down from carrier parents: recessive
7. Tends to affect males more severely: sex-linked