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Download Dominant and Recessive Trait_Quick Lab
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Name__________________________________Class __________________ Date ________________________ QUICK LAB What’s the Difference Between a Dominant Trait and a Recessive Trait? In this lab you will simulate crosses between different colored flowers. The results of the crosses will help you see patterns of inheritance that involve dominant and recessive traits. PROCEDURE Your teacher will tell you what the colored beads represent. Write down which bead represents a dominant allele and which bead represents the recessive allele. ___________________________________________________ ___________________________________________________ Which pair(s) of alleles will result in the dominant trait showing in the phenotype? OBJECTIVE • Observe the relationship between phenotype and genotype. MATERIALS For each student pair • bag, paper lunch • beads, 2 colors (6 of each color) • paper • pencil ________________________________________________________________________ Which pair(s) of alleles will result in the recessive trait showing in the phenotype? ________________________________________________________________________ If you remove a total of four beads from the bag, how many combinations of alleles are possible with two colors of beads? ________________________________________________________________________ Without looking, remove two beads at random from the bag to represent the maternal genotype. Then remove another two beads at random to represent the paternal genotype. Write down the two pairs of beads you selected. ________________________________________________________________________ ________________________________________________________________________ Follow Steps 6 – 10 on back What can you conclude about the F2 phenotypic ratios if one parent is homozygous dominant and the other is homozygous recessive? ________________________________________________________________________ ________________________________________________________________________ Name__________________________________Class __________________ Date ________________________ Simulate a parental monohybrid cross between the two genotypes by entering the alleles in the gray boxes in the table below (called a Punnett square). When these two parents are crossed, the four possible offspring outcomes (white boxes) represent the F1 generation. Maternal genotype Paternal genotype What phenotypes do you see in the F1 generation? ________________________________________________________________________ ________________________________________________________________________ Take any two of the genotypes from your table for the F1 generation and simulate another monohybrid cross between the two genotypes by entering the alleles in the table below. This represents the F2 generation. Maternal genotype Paternal genotype What phenotypes do you see in the F2 generation? ________________________________________________________________________ ________________________________________________________________________ Repeat Steps 5 through 9 until you have simulated several different combinations of alleles (from Step 4). (If you get the same color beads, draw again – you want to cross different genotypes each time.) Create additional Punnett squares on a separate piece of paper if needed.
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