LessonGrades 6 - 8
Human Genetics, Chromosomes and Alleles: What’s Dominant?
Chromosomes viewed through a microscope.
In a class discussion format, students are presented with background information about basic human genetics.The number of chromosomes in both body cells and egg and sperm cells is covered, as well as the concept of dominant and recessive alleles. As an example, students determine whether or not they possess the dominant allele for the tongue-rolling gene.
An evolving understanding of genes is currently leading genetic engineers to develop treatments to cure genetic disorders.
After this lesson, students should be able to:
- State the number of chromosomes in human body, sperm and egg cells.
- Explain why sperm and eggs cells have only half the number of chromosomes found in the body cells.
- Give a brief definition for allele.
- Explain the difference between dominant and recessive alleles, and give an example.