Prenatal Development

Agenda- February 9th

1-Unit 1 Quiz

2- Begin Reading Chapter 4 in your textbooks.

3. Lesson: What are Genetic Factors?

Find in the Textbook: Genetic Factors and the Unborn Baby Explain the significance of Genetic

Factors.

What are chromosomes—what is their role?

Traits: Distinguish between dominant and recessive traits

Genetic Factors The Genetic code is found in DNA

molecules which compose the chromosomes.

We have 23 pair of chromosomes

The sex of the child is determined by the 23rd pair of chromosomes. The male X or Y chromosome determine the child’s sex.

In the textbook: Multiple Pregnancy What is multiple pregnancy?

Agenda- February 10th 1.Multiple Births

2. Textbook Search: The Stages of Prenatal Development & Definitions

3. Assignments: Twins PowerPoint & Prenatal Story

Fraternal Twins A fraternal birth is caused when multiple

babies develop from two or more ova. Each ova is fertilized with different sperm.

Therefore…there is a different genetic makeup . These babies are as much alike and different as any other brothers and sisters.

Identical twins Children who develop from one single

ovum, fertilized by a single sperm. The ovum splits to produce two or more children.

If the ovum does not completely spit, the babies will become conjoined twins.

Identical Twins These twins have the same genetic makeup due to

the fact that they came from one fertilized ovum.

Very similar in appearance.

Except for their genes, identical twins are not exactly alike. (Finger prints, foot prints are not exactly the same).

Environment can make them different.

3 Stages of Prenatal Development Germinal Stage

Embryonic Stage

Fetal Stage

3 Stages of Prenatal Development Conception marks the beginning of the

germinal stage. This stage covers about 2 weeks of the pregnancy. During this stage, the zygote floats freely in the uterus before implantation; cells divide.

Stages…continued. The most critical stage of pregnancy is

the embryonic stage. The body systems develop. This stage lasts about 6 weeks. By the end of this stage the embryo looks human.

When the bone cells start to replace cartilage the baby enters the fetal stage.

From this point until birth the baby is

called a fetus. During this stage all parts of the body mature and overall size increases.

Fetal Stage Two milestones happen during the

fetal stage: 1) the baby’s heart beat can be heard in

the 3rd month of pregnancy. 2) between the 4th and the 5th months

the mother will begin to feel the baby move http://www.youtube.com/watch?v=7gFy7sUnJ4w

Define these terms/ Answer Questions (Fetal Stage) Quickening

Age of Viability

What happens in the ninth month that is so significant?

Assignment: Groups of Two

1. Prepare a PP of pictures of identical twins and fraternal twins. Try to find pictures of the same people taken over a few years (5 sets of twins). You are expected to present these PPs and provide some observational insights.

Present on: Monday, February 16th

2. *To be done individually: Write a story about prenatal development from the unborn baby’s point of view. Use your creativity to express what life might be like for the baby (2 pages—double-spaced).

Due: Monday, February 16th

Agenda- February 11th

1. Work on Twins PowerPoint (To be Presented on Monday, February 16th )

2. Work on Prenatal Story (Due on Monday, February 16th )

3. Go over Textbook Hunt Responses

Agenda- February 12th 1. Work on Twins PP

2. Work on Prenatal Story

3. Read: Page 129-132 in the textbook (Prenatal Care) Write down some presumptive and positive signs of pregnancy from page 131.