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| Description: Vocabulary • Dominant Allele – a version of a gene that is expressed if there is one or more copies of the allele present and it hides a recessive allele • Recessive Allele – a version of a gene that is expressed only if there are two copies of the allele present, it is hidden by a dominant allele • Genotype – the genes in an organism that determine a given trait or set of traits • Phenotype – the observable expression of a trait • Incomplete Dominance – a cross between two organisms with different phenotypes produce offspring with a third phenotype that is a blend of the parental traits • Punnett Square – a diagram used to predict the possible outcomes of a particular breeding cross • Predator – an organism that eats anther organism • Population – a group of interbreeding organisms of the same species Important Gummy Bear Life History Traits • Gummy bears come in 5 colors: red, yellow, orange, green, and white. Gummy bear color is an inherited trait. It follows the inheritance pattern given below. • Gummy bears mate for life. Once a gummy bear has chosen a partner, it won’t breed with any other gummy bears. • Gummy bears only reproduce once. • Gummy bears mature quickly, so they can reproduce soon after they are born. • Gummy bears cannot breed with their siblings. • Gummy bears have many natural predators. Gummy Bear Color Inheritance Patterns • Red: incomplete dominance with yellow to create orange; dominant to green and white. • Yellow: incomplete dominance with red to create orange; dominant to green and white. • Green: recessive to red and yellow; dominant to white • White: recessive to red, yellow; and green • A red gummy bear can have the following genotypes: cr cr (two red alleles) cr cg (one red allele and one green allele) cr cw (one red allele and one white allele). • A yellow gummy bear can have the following genotypes: cy cy (two yellow alleles) cy cg (one yellow allele and one green allele) cy cw (one yellow allele and one white allele). • An orange gummy bear can have the following genotype: cr cy (one red allele and one yellow allele). • A green gummy bear can have the following genotypes: cg cg (two green alleles) cg cw (one green allele and one white allele). • A white gummy bear can have the following genotype: cw cw (two white alleles). There are going to be lots of generations and pairs of gummy bears. It may help to fill out the attached chart so that you keep track of everything. Parent Generation 1. Without looking, choose two gummy bears from the paper bag. This is your first breeding pair (Parent 1 and Parent 2). Write the genotypes and phenotypes for this pair. If there is more than one possible genotype for one or both of your gummy bears, you need to choose what the genotype(s) will be. Parent 1 Phenotype: Parent 1 Genotype: Parent 2 Phenotype: Parent 2 Genotype: 2. Choose two more gummy bears from the bag. This is your second breeding pair (Parent 3 and Parent 4). Write the genotypes and phenotypes for this pair. If there is more than one possible genotype for one or both of your gummy bears, you need to choose what the genotype(s) will be. Parent 3 Phenotype: Parent 3 Genotype: Parent 4 Phenotype: Parent 4 Genotype: Picture Stats: Views: 952 Filesize: 148.91kB Height: 791 Width: 627 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40701 |