Curriculum Entry Point under the K-12 curriculum:
Grade 9 – Non-Mendelian genetics
Science/Math Key Ideas:
- Sex linked traits are traits that are located in the sex chromosomes. Some of these notable sex-linked traits like colorblindness and hemophilia are expressed by recessive genes.
- Certain offspring may or may not express the gene depending on the pairing of the sex chromosomes as a result of the union of the gametes (spermatozoa and egg cell) that carry such chromosomes.
- The recessive gene for colorblindness (represented by “b”) is usually found in the X chromosome. This trait is therefore expressed when paired with a Y chromosome. Therefore, the male offspring will become colorblind. If paired with another X chromosome that has no gene for colorblindness (represented by “B”), the trait will not be expressed since it is a recessive gene. Therefore, the female offspring will not suffer from colorblindness but become carriers who can pass it to their children.
- Female children can also suffer from colorblindness. For instance, the mother is a carrier for colorblindness and the father is colorblind.
Features of the resource:
In Grade 9 – the Learning Object explains how genes located at the sex chromosomes influence the phenotype for a particular gender. Concepts are applied by providing formative assessment and explanation of the answers.
For the teacher, an online manual on how to construct Learning Objects (LO) using Microsoft Powerpoint Presentation is delivered in a stepwise fashion.
Question/s for (further engagement with) teachers:
How can the use of learning objects be useful in teaching science lessons in class?