Presentation on theme: "Chapter 12 Growing and Changing Lesson 5 Heredity and Human Development Next >> Click for: Teacher’s notes are available in the notes section of this presentation."— Presentation transcript:
Chapter 12 Growing and Changing Lesson 5 Heredity and Human Development Next >> Click for: Teacher’s notes are available in the notes section of this presentation. >> Main Menu >> Chapter 12 Assessment
chromosomes Threadlike structures that carry genes The basic units of heredity genes The basic unit of life cell
tissue A group of similar cells that do a particular job A body part made up of different tissues joined to perform a particular function organ A group of organs that work together to carry out related tasks body system
embryo The developing organism from two weeks until the end of the eighth week of development The developing organism from the end of the eighth week until birth fetus
In this lesson, you will learn to explain how humans inherit certain characteristics. identify the basic unit of life. describe how a fetus develops. identify ways an expectant mother can care for her developing fetus.
Analyzing a Graphic Using the diagram shown here, create a concept map about the different levels of body structure. As you read the lesson, fill in the concept map. Levels of Body Structure Cells
Heredity When a sperm and egg unite, the newly fertilized egg has a complete set of chromosomes. chromosomes Threadlike structures that carry genes Genes carry the codes for inherited traits. genes The basic units of heredity
Fertilization and Human Development How does a single cell become a person made of many cells? cell The basic unit of life Soon after fertilization, the fertilized egg begins to divide and multiply.
Fertilization and Human Development Groups of cells make up tissues and tissues then make up organs. tissue A group of similar cells that do a particular job organ A body part made up of different tissues joined to perform a particular function
Fertilization and Human Development Eventually, an entire body system is formed. body system A group of organs that work together to carry out related tasks
Development of the Fetus embryo The developing organism from two weeks until the eighth week of development A fertilized egg is called a zygote. After one week, the zygote attaches to the lining of the uterus. After another week, the zygote is called an embryo. The zygote divides to form 2 cells about 24 hours after fertilization.
Fertilization and Human Development After the eighth week, the human embryo is called a fetus. fetus The developing organism form the end of the eighth week until birth. Birth takes place about nine months after fertilization.
Care During Pregnancy Positive Health Behaviors for Expectant Mothers Eat healthful foods Have regular checkups Beware of infections Don’t use tobacco Don’t drink alcohol Don’t take unnecessary drugs
What I Learned Vocabulary Define chromosomes. Lesson 5 Review
What I Learned Identify List four levels of body organization from most complex to most basic. Lesson 5 Review
What I Learned Describe Describe the development of a human from the point of fertilization. Lesson 5 Review
What I Learned List What are four ways that a pregnant female can care for her developing baby? Lesson 5 Review
Thinking Critically Apply A test of Ling’s fetus shows that its cells each have one more chromosome than normal human cells. How many chromosomes does each of her fetus cells have? Lesson 5 Review
Thinking Critically Analyze Using the information given in Figure 12.9, calculate the weight that the developing fetus gains at each three month stage. During which stage does it gain the most weight? Lesson 5 Review
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