Untitled Flashcard Set

What is Behavioral Genetics?

The scientific study of how genetic and environmental factors interact to influence behavior.

What are Genes and their function?

Genes are 'recipes' for making proteins, which in turn affect the structure and function of cells. Humans have about 20,500 genes located on chromosomes.

List the three periods of prenatal development.

1. Germinal period 2. Embryonic period 3. Fetal period

Describe the Germinal period.

It begins with conception and ends when the fertilized egg (zygote) implants in the uterine wall, lasting approximately 2 weeks. Cell division (mitosis) occurs during this period.

Describe the Embryonic period.

Lasts from 3 to 8 weeks after conception. Blood vessels from the trophoblast form the placenta, and major body structures begin to develop.

What are the two growth patterns during the Embryonic period?

1. Cephalocaudal: From head to tail. 2. Proximodistal: From the midline outward.

Describe the Fetal period.

Extends from 9 weeks post-conception until birth. Major structures continue to develop and grow. The age of viability (first chance of survival outside the uterus) is typically 24 weeks.

What are Teratogens and the factors influencing their impact?

Environmental factors that can contribute to birth defects. Their impact is influenced by timing, number, exposure, and genetics.

Name and briefly describe common Prenatal Assessment Methods.

1. Ultrasound: Uses sound waves to examine the fetus. 2. Amniocentesis: Samples amniotic fluid for genetic analysis. 3. Chorionic villus sampling (CVS): Samples placental tissue for genetic analysis.

What is an Ectopic pregnancy?