Child Development Chapter 4

The age at which most babies could survive if they were born (28th week of pregnancy)

Age of viability

A fluid-filled sac that protects the baby until birth.

Amnion

Why can people pass on traits that don't show up in them?

Because some traits are dominant and some are recessive

Soft, elastic, flexible tissue that provides structure for the body

Cartilage

Smallest unit of life able to reproduce itself

Cell

Outer membrane surrounding baby in uterus

Chorion

Threadlike structures that carry genes in living cells

Chromosomes

The union of the ovum and sperm cell

Conception

The age of viability is the...?

Earliest age at which most babies survive if born

Term used to describe a baby in the second stages of development

Embryo

Drugs and diseases of the mother are most dangerous to the unborn in the ____ of prenatal development... a. germinal stage b. embryonic stage c. fetal stage d. none of the above

Embryonic stage

The second stage of prenatal dev.; lasts about 6 weeks

Embryonic stage

Two hollow tubes that connect to the uterus and have fingerlike projections that reach toward each ovary

Fallopian tubes

A new life begin when an ovum and a chromosome unite

False

Each baby receives 28 pairs of chromosomes

False

The egg and sperm typically unite as the egg enters the uterus

False

when bone cells start to replace cartilage, bout nine weeks after conception, the baby enters the ___ stage. a. germina b. embryonic c. fetal d. viability

Fetal

The third stage of pregnancy

Fetal stage

The term used to describe a baby in the last stage of dev.

Fetus

In the ninth month of pregnancy, the... a. heartbeat of the fetus is first heard through stethoscope b. fetus grows slowly c. fetus receives immunities form the mother d. mother begins to feel the movements of the fetus

Fetus receives immunities form the mother

Term describing children of multiple pregnancy that develop form two fertilized eggs and differ in genetic makeup

Fraternal

Traits passed throughout the genes form parent to child

Genetic factors

During which stage does the placenta begin to develop? a. germinal stage b. embryonic stage c. fetal d. none

Germinal Stage

The first stage of prenatal dev. which lasts about 2 weeks

Germinal stage

The first stage of prenatal development begins at conception and is called the...

Germinal stage

Term describing children of a multiple pregnancy that develop from one fertilized egg and share genetic makeup

Identical

Pregnancy in which two or more babies develop

Multiple pregnancy

Female sex cell, aka egg

Ovum

An organ filled with blood vessels that nourishes the baby in the uterus

Placenta

Type of dev. that takes place between conception an birth

Prenatal Development

Movements of the fetus that can be felt by the mother

Quickening

Male sex cell

Sperm

If a husband and wife both have brown eyes (a dominant trait) but also carry a trait for blue eyes (a recessive trait), what is known about their children's eye color?

The children's eyes might be blue or brown

A gender of a child is determined by... a. the father b. the mother c. neither d. conditions in the uterus

The father

A baby's genes from both the mother and the father control how the baby grows and develops even before birth

True

Chromosomes are threadlike structures that carry genes in living cells

True

Each human cell contains about one million genes

True

The genes of fraternal twins are less alike than those of identical twins

True

The joining of an egg and a sperm is called conception

True

The nucleus of the zygote contains a set of instructions called a genetic code for building a living being

True

The uterus is the organ inside which a baby develops and is protected until birth

True

Connects the baby to placenta

Umbilical cord

The organ in which the baby developed and is protected until birth

Uterus

Single cell formed at conception, aka a fertilized egg

Zygote