What will the students do to explore the concepts and skills being developed through the lesson? After students complete the worksheet have a class discussion to clarify their ideas. Have students copy a diagram in their notebook similar to the one below to show the relationship between DNA, chromosomes, and genes: What combination of sex chromosomes do females have? How many chromosomes do humans have? What is a karyotype? Heredity is the passing of the traits from one generation to another.
Lead a discussion on chromosomal abnormalities. MSCI, which has been best characterized in mammals, 38 is an epigenetic phenomenon that involves chromatin remodeling as well as DNA repair, specifically the repair after double-stranded breaks that occur in meiotic recombination. In contrast, sex chromosomes will deviate from equal representation. When you crossed the purple and the white flowers and got all purple offspring was it because the offspring only inherited the purple genes? Diverse taxa of multicultural eukaryotes e. Both male heterogamety and female heterogamety have independently evolved numerous times. Chromosomes are made of DNA. What would be the possible offspring if you crossed a flower with a purple gene and a white one with a flower that had only white genes? What object, event, or questions will the teacher use to trigger the students' curiosity and engage them in the concepts? How are genes and chromosomes related? Whether MSCI exists in Drosophila has been the source of substantial, periodic controversy over the past four decades. What will students know and be able to do as a result of this lesson? How do evolutionary processes affect sex chromosomes? How are traits passed from parents to the children? How pairs of chromosomes does this person have? What will the students and teacher do so students have opportunities to clarify their ideas, reach a conclusion or generalization, and communicate what they know to others? How many chromosomes do humans have? In the following sections of this review, we provide a detailed exploration of the multifarious consequences, focusing on recent studies. Following standard notation, females and males are XX and XY, respectively, in male heterogametic systems, and males and females are ZZ and ZW, respectively, in female heterogametic systems. Extension Encourage students to complete research on various chromosomal abnormalities and to report their findings to the class. Activity Part 2 Divide students into pairs. After students complete the worksheet have a class discussion to clarify their ideas. You will work independently; following the directions you will be given. Several consequences stem from this hemizygosity. Make 16 toothpicks of each color dot for every pair of students. Likewise, the W chromosome in ZW female heterogametic systems will be present only in females. Go over these points with the students:
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