Biology B/ Pedigrees and Genetic Engineering

Genetic disorder that affects a central portion of the brain by causing the death of brain cells.

Early symptoms include mood swings, memory loss, depression and twitching.

Late symptoms include involuntary spasms and difficulty performing the most basic tasks such as eating, walking and talking.

Huntington’s Disease is the result of a defect on the 4th chromosome

This disease is autosomal dominant, which means that having the disease is the dominant trait and the disease shows complete dominance.

Tay Sach’s Disease results from fatty substances that build up in the body and break down brain and nerve cells.

Symptoms do not appear for the first few months of life, but children with Tay Sach’s generally die by age 4 or 5.

Symptoms include: losing muscle strength, not smiling or crawling, seizures, paralysis, deafness and blindness.

Tay Sach’s disease is the result of an enzyme that does not function properly.

Tay Sach’s is a sex-linked recessive disorder, which means that having the disorder is a recessive trait and the allele is located on the X chromosome.

Genetic disorder that results in a very sticky mucus coating the lungs, making them more likely to become infected.

Cystic Fibrosis is a autosomal recessive disorder, which means that having the disorder is a recessive trait and the allele is found on a normal (non-sex) chromosome.

Genetic disorder causing a failure to produce melanin, a pigment that protects the skin and eyes.

This means the person lacks pigment in skin, hair and eyes.

This disorder is autosomal recessive, which means having the disorder is a recessive trait and the allele is found on a normal (non-sex) chromosome.