Exam 5: Heredity and Disease

Galactosemia is an _____ disorder.

Congenital defects usually occur during the first two months of pregnancy.

In Down syndrome chromosome 21 is inherited in triplicate, a condition called _____ 21.

DNA, which stands for _____ acid, is the chemical blueprint that directs all cell activities.

Phenylketonuria is an _____ disorder.

Huntington's disease is a neurodegenerative disorder.

An amniocentesis can only detect about 50 of the thousands of known genetic disorders.

The complete chromosomal composition of the nucleus is called the _____.

Only gametes contain 23 chromosomes, one chromosome of each pair, a condition called _____.

A female has a combination of one X and one Y chromosome.

Pseudohermaphrodites have either testes or ovaries, but the remainder of the anatomy is mixed.

Somatic cells contain 46 chromosomes in 23 pairs, a condition called _____.

A Down syndrome child is always mentally impaired to some degree.

Two of the chromosomes, the X and Y chromosomes, are called _____ chromosomes.

If alleles are different, then a person is _____ for the trait that allele expresses.

Huntington's disease is an _____ disorder.

Congenital diseases can be transmitted to offspring.

_____ is an inborn error of sugar metabolism that can lead to impaired mental development and liver damage.

_____ is an absence of the pigment melanin, resulting in colorless white skin, hair, and eyes.

Tay-Sachs is an _____ disorder.