Dragon Genetics Introduction The simplest form of genetic inheritance for a single trait involves receiving one piece of genetic information (one allele) from the mother and one piece of genetic information (one allele) from the father. Sometimes the information from the mom and dad is identical, and sometimes it is not. The resulting combination of alleles is referred to as a genotype ; the physical expression of the trait that is coded for is referred to as the phenotype . Using a tool called a Punnett square, you can predict the likelihood that an offspring will inherit a certain allele combination ( genotypic ratio ) and therefore predict the likelihood that they will express certain traits in their physical appearance ( phenotypic ratio/percentage ). Essential Question How does Mendelian genetics explain the variation of expressed traits within a population? Pre-lab Watch the short video and answer the questions below in your science notebook. 1. What is fertilization? 2. What happens to the chromosomes of the egg and sperm during fertilization? 3. What would happen (genetically) if the egg in the video had chosen a different sperm? Materials ( Per Student Group of 2) 1 3” Plastic egg of one color (egg) with 4 pink chromosomes inside. (numbered) 1 2” Plastic egg of one color (sperm) with 4 blue chromosomes inside. (numbered) 1 Glue Stick or tape 2 coins per pair Extra paper Colored Pencils Scissors Copy of lab procedure, student data sheet, and copy of dragon cut-outs Procedure Part I: First Generation 1. Each student will receive a dragon egg with a number. Students should pair up making sure egg numbers match. 2. Each egg and sperm contains four numbered chromosomes. Find chromosome #1 from the mother and the father. Pair these 2 chromosomes together to see the combined genetic code for chromosome #1. All four chromosomes in the egg should be pink and the four chromosomes in the sperm should be blue. 3. Using the corresponding chromosome, necessary office supplies, and the dragon key, create a baby dragon. Be sure to put your group’s name on the back of your dragon. You are welcome to name your dragon and color the background of your paper if time permits.
- Summer '14
- Genetics, 5E student handout, Genetics 5E student, Dragon Genetics 5E