Chapter 2: Introduction to Prenatal Development

According to Matt Ridley, how do genes behave during life?

• They are only active before birth and never change.

• They are active during life, switching each other on and off in response to the environment.

• They remain inactive and do not respond to the environment.

• They only carry hereditary information and do not affect the body after birth.

Which of the following best describes the role of genes as explained in the provided text?

• Genes are unchanging blueprints that only determine physical traits.

• Genes are passive carriers of heredity with no influence after birth.

• Genes are dynamic, responding to the environment and influencing both the construction and reconstruction of the body and brain.

• Genes only function during the construction of the body in the womb.

Why is it important for humans to have 23 pairs of chromosomes?

• It ensures the correct amount of genetic information is passed to offspring.

• It allows humans to have more than one gender.

• It prevents humans from aging.

• It increases the number of cells in the body.

Which test is used to detect chromosomal abnormalities using amniotic fluid?

• T21 test

• Chorionic villus sampling (CVS)

• Amniocentesis

• Blood typing

Which genetic disorder is characterized by Trisomy-21?

• Down Syndrome

• Turner Syndrome

• Klinefelter Syndrome

• Cystic Fibrosis

What is a dominant gene disorder?

• A disorder where a single allele can control whether the disease develops

• A disorder that requires two copies of a defective gene to develop

• A disorder that only affects carriers

• A disorder that never results in a genetic disease

Which disorder is mentioned as an example of a dominant gene disorder that can cause uncontrollable tics and explosive outbursts?

• Huntington’s disease

• Prion disease

• Tourette syndrome

• Down syndrome

Father's sperm determines the sex of the child.

• True

• False

Monozygotic twins are fraternal twins.

• True

• False