Prenatal Development

Agenda- February 9 th  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 23 rd 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 10 th  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 3 rd month of pregnancy.  2) between the 4 th and the 5 th months the mother will begin to feel the baby move 7sUnJ4w 7sUnJ4w

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 16 th  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 11 th  1. Work on Twins PowerPoint (To be Presented on Monday, February 16 th )  2. Work on Prenatal Story (Due on Monday, February 16 th )  3. Go over Textbook Hunt Responses

Agenda- February 12 th  1. Work on Twins PP  2. Work on Prenatal Story  3. Read: Page in the textbook (Prenatal Care) Write down some presumptive and positive signs of pregnancy from page 131.