Presentation is loading. Please wait.

Presentation is loading. Please wait.

A Closer Look at Conception

Similar presentations

Presentation on theme: "A Closer Look at Conception"— Presentation transcript:

1 A Closer Look at Conception
The Developing Child Chapter 5 Section 2

2 Introduction: The Genetic Package
Each of us inherit many personal characteristics from our parents. EX: physical build, skin color, hair color & texture, eye color & shape. Just as personal traits can be passed on, so can medical conditions.

3 Chromosomes Tiny threadlike particles located in the nucleus of every cell. 46 chromosomes = 23 pairs

4 Genes Each chromosome contains several genes.
Genes- the unit that determine the child's inherited characteristics. Genes makeup chromosomes as beads make up a necklace. For every inherited characteristic, a person receives 2 copies- 1 from mom and 1 from dad.

5 Genes If both inherited genes are the same- then the child will have that characteristic. If they are different- the dominant gene will be expressed. Dominant- stronger gene. Recessive- weaker gene.

6 Genes Ex: B= Brown Dominant, b= Blue recessive. Dad (Bb) Mom (Bb)
Child 1 Child 2 Child Child 4 (BB) (Bb) (Bb) (bb)

7 Making A Unique Person Each sperm & egg cell contains a different combination of genes. These cells combine during the fertilization process and produce a unique individual.

8 Determining Sex The sex of a child is determined at conception.
Every egg cell contains an X chromosome. Each sperm cell will contain either an X or a Y chromosome. The sex of the child is determined by the chromosome carried by the sperm that fertilizes the egg. XX= baby girl XY= baby boy

9 Multiple Births Identical Twins= 1 egg divides in half soon after fertilization. Each half grows and divides. 1 Zygote becomes 2. Fraternal Twins= 2 eggs are released and both becomes fertilized

10 Infertility Infertile- inability to conceive a child.
There are many causes of infertility in both men and women. Options for Infertile Couples: Adoption- a couple legally takes on all responsibilities and rights for raising, loving, and caring for a child in need of a permanent home. Artificial Insemination- doctor injects sperm into the uterus. Sperm may be the husband’s or from a donor.

11 Infertility Options for Infertile Couples:
In Vitro Fertilization- Doctor combines a mature ovum from the woman with sperm from her husband. If the ovum becomes fertilized then the doctor places it in the uterus. Ovum Transfer- Similar to In Vitro, except that the ovum is donated by another woman. It is fertilized in the laboratory and placed in the uterus. Surrogate Mother- A surrogate mother is a substitute woman who becomes pregnant to have a baby for another woman.

12 Let’s Review List 3 traits that are inherited.
Explain how dominant and recessive genes work. How is the sex of a baby determined? What is the difference between identical twins and fraternal twins? What are some disadvantages of fertility drugs?

13 Assignment Heredity in the Works Worksheet

Download ppt "A Closer Look at Conception"

Similar presentations

Ads by Google