What are observable genetic traits like red hair, freckles, and brown eyes called?

Genes are the basic units of genetic information that determine the nature and function of every cell in the body, and are composed of?

Which chromosomes contain the XX (female) or XY (male) chromosomes?

Genetic variability results from the creation of eggs and sperm through which process?

Down Syndrome results from what genetic change?

Nonshared environments are different experiences of siblings. These could also be different experiences of friends. Check all that may be nonshared experiences.

How many drinks per day is considered safe during pregnancy?

Which prenatal period lasts the longest (weeks 9-38)?

Which organ, connected by the umbilical cord (mother and fetus), provides blood/oxygen and aids in brain development by filtering out teratogens?

During which prenatal stage (weeks 3-8) are 100,000 neurons produced every minute?

Which prenatal stage starts in weeks 9 to 38 when major organs have differentiated?

What is an environmental agent (drug, chemical, virus, or other factor) that produces a birth defect?

When is the developing fetus most susceptible to teratogens?

Which drugs cross over to the developing fetus? (Select all that apply)

Which infants are born before 38 weeks and constitute about 11% of all births?

Although only 7% of US babies are low birth weight babies (under 5 1/2 pounds), they account for?

The infant mortality rate (IMR) in the US is considered high. Select all factors that would reduce the IMR.

Any differences between monozygotic twins are said to be the result of (select all)?

What is niche picking (best answer)?

Cells that reproduce through meiosis are called?

How many chromosomes (not pairs) are most humans born with?

What is the term for the fertilized egg during the first two weeks after conception?