Lesson: Inherited Disorders Biology • First Year of Secondary School

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).