Lesson: Inherited Disorders Biology • First Year of Secondary School

In this lesson, we will learn how to use genetic diagrams to predict probabilities of offspring inheriting recessive or dominant genetic disorders.

Lesson Plan

Students will be able to

define the terms gene and allele,
define a dominant allele as one that is always expressed in a phenotype and a recessive allele as one that is only expressed when two copies are present,
describe inherited disorders as diseases or disorders caused by the inheritance of certain alleles,
carry out a genetic cross to show the inheritance of recessive and dominant alleles,
understand that the inheritance of some alleles can be lethal (e.g., alleles causing yellow fur in mice, the absence of chlorophyll in plants).