Key Terms - Chapter 3

Question 1

Age of Viability

Answer 1

The time in pregnancy where the fetus has reached a point in development that it can potentially survive outside of the uterus after birth.

Question 2

Amniotic Sac

Answer 2

Sac formed by amnion and chorion, containing fluid and the fetus.

Question 3

Autosomes

Answer 3

Any chromosome within the body except the sex chromosomes (x and y)

Question 4

Chorion

Answer 4

The fetal membrane closest to the interior uterine wall

Question 5

Decidua

Answer 5

The part of the decidua that unites with chorion to form the placenta. It is shed in lochial discharge after birth

Question 6

Diploid

Answer 6

Cell or organism containing a set of maternal and a set of paternal chromosomes. 46

Question 7

Dizygotic

Answer 7

Fetuses that develop from two fertilized ova, fraternal twins

Question 8

Fertilization

Answer 8

The union of an ovum and sperm

Question 9

Gametogenesis

Answer 9

The development of a sex cell, such as an ovum or sperm

Question 10

Germ Layers

Answer 10

Three primary layers, ectoderm, mesoderm, and endoderm. Each develops into different part of the growing embryo

Question 11

Haploid

Answer 11

A single set of chromosomes that are not paired. 23

Question 12

Monozygotic

Answer 12

Two fetuses that develop from a single divided, fertilized ovum. Identical Twins.

Question 13

Oogenesis

Answer 13

The process of mitosis in ovum

Question 14

Placenta

Answer 14

A specialized disk shaped organ that connects the fetus to the uterine wall for gas, nutrient, and waste exchanges.

Question 15

Spermatogenesis

Answer 15

The process by which mature spermatozoa are formed and during which the number of chromosomes is reduced by half

Question 16

Teratogens

Answer 16

A non-genetic factor that can produce malformations of the fetus