Student Exploration: Chicken Genetics
Vocabulary: allele, codominance, dominant, genotype, heterozygous, homozygous, phenotype, probability, Punnett square, recessive, trial
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
The image shows a flower that was produced by crossing a pure red flower with a pure white flower. Which do you think is the dominant petal color: red or white? Explain.
How is the inheritance pattern shown by this flower different from other inheritance patterns you have seen or studied?
There are many different ways traits can be inherited. Some traits are governed by alleles that are dominant over other alleles. Other traits are governed by alleles that share dominance. These alleles follow a pattern of inheritance called codominance. With the Chicken Genetics Gizmo™, you will study how codominance affects the inheritance of certain traits.
Turn on Show genotype. The genotype is the allele combination an organism has. Point to the red chicken.
What is the red chicken’s genotype?
What is the white chicken’s genotype?
What do you think the letters F, R, and W stand for in the genotypes?
Get the Gizmo ready:
Drag a red chicken and a white chicken into the parent boxes, but don’t click Breed yet.
Question: What inheritance patterns do codominant traits display?
Predict: What do you think the offspring of a red chicken and a white chicken will look like?
Observe: Click Breed. What are the offspring genotypes?
An organism’s appearance is its phenotype. Describe the offspring’s phenotype.