Gummy Bear Lab - Pedigree and Genotype Analysis
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Gummy Bear Lab
Mom is Homozygous Dominant & Dad is Homozygous Recessive.
The Dominant trait is _______________ The recessive trait is _______________
[Pedigree Chart with the following individuals to fill out:]
1. Mom (Circle): Genotype: ____ Phenotype: ____
2. Dad (Square): Genotype: ____ Phenotype: ____
3. Offspring (Square): Genotype: ____ Phenotype: ____
4. Offspring (Circle): Genotype: ____ Phenotype: ____
5. Offspring 3 (Circle): Genotype: ____ Phenotype: ____
6. Teddy (Square) [Labeled Homozygous Recessive]: Genotype: ____ Phenotype: ____
7. Offspring (Square, Generation 3): Genotype: ____ Phenotype: ____
8. Offspring (Square, Generation 3): Genotype: ____ Phenotype: ____
Legend:
Circle = Female
Square = Male
This question includes visual content: A pedigree chart diagram titled 'Gummy Bear Lab'. It uses standard pedigree symbols: circles for females and squares for males. The first generation consists of 'Mom' (circle) and 'Dad' (square) connected by a horizontal mating line. Above them, text states: 'Mom is Homozygous Dominant & Dad is Homozygous Recessive.' The first generation has three offspring: 'Offspring' (square), 'Offspring' (circle), and 'Offspring 3' (circle). 'Offspring 3' is connected via a mating line to 'Teddy' (square), who has a handwritten note 'Homozygous Recessive' above him. This pair has two male 'Offspring' in the third generation. Under each individual, there are blanks for 'Genotype:' and 'Phenotype:'. A legend on the right shows a circle equals female and a square equals male, next to a small graphic of a gummy bear.
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Step by Step Written Solution
In this Gummy Bear Lab, we are going to determine the genotypes and phenotypes for several generations of gummy bears. We're told that Mom is homozygous dominant and Dad is homozygous recessive.
Gummy Bear Pedigree Analysis
Let's use the letter capital G for the dominant allele and lowercase g for the recessive allele. Since Mom is homozygous dominant, her genotype must be capital G, capital G. Dad is homozygous recessive, so his genotype is lowercase g, lowercase g.
Now, let's look at the first generation of offspring. Because this is a cross between a homozygous dominant and a homozygous recessive parent, let's visualize it with a Punnett Square.
When we fill this in, every single offspring will receive one capital G from Mom and one lowercase g from Dad. This means we have a hundred percent probability of getting the heterozygous genotype.
So, Offspring one, two, and three all have the genotype capital G lowercase g. Their phenotype will be the dominant trait because they carry the dominant allele.
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