Exam 37: A: Genetics and Heredity

Fetal tissue can be collected by amniocentesis,a procedure in which fetal cells floating in the amniotic fluid are collected with a syringe.

A genetic disease or condition that requires a specific environmental condition for expression is called a predisposition.

Fetal alcohol syndrome can be classified as both a congenital and genetic disorder.

The Y chromosome is larger than the X chromosome.

A disease carried on mDNA must be received from the mother.

The symptoms of osteogenesis imperfecta frequently disappear after puberty.

Genetic mutations are always harmful.

Theoretically,the best chance for producing a girl infant would be for insemination to occur on the day of ovulation.

Fatal mutations are the least harmful to the population as a whole.

A person who received a human-engineered chromosome as a form of gene therapy would have 47 chromosomes in that cell.

In a pedigree,a partially shaded circle would indicate a female carrier for the trait.

One hypothesis regarding cancer involves the presence of oncogenes that,under normal conditions,regulate cell division so that it proceeds normally.

If PKU victims avoid large amounts of phenylalanine in their diets,especially during critical stages of development,severe complications can be avoided.

Autosomes not only carry the same genes but also are carried in the same location on the chromosome.

The function of DNA is to transcribe the genetic code to tRNA.

Because there have been tragic setbacks is some gene therapy clinical trials,there are presently no approved gene therapies available.

Sickle cell inheritance is a good example of how codominance works.

Oncogenes are altered forms of normal genes.

The sperm cytoplasm rather than the sperm nucleus is responsible for transmission of mitochondrial DNA.

Because of our greater complexity,the human genome carries about eight times as many genes as the fruit fly does.