Part A

Random Mating

1. Obtain three containers, and label them "Parental," "Offspring," and "Dead."

2. Place 200 black beads and 200 white beads in the "Parental" container. Assume that each black bead represents a dominant allele for black coat (B) and that each white bead represents a recessive allele for white coat (b) in a hypothetical animal. Assume that the container holds gametes from a population of 200 of these hypothetical animals: 50 BB, 100 Bb, and 50 bb.

3. In your lab report, make a data table like Table A.

4. Without looking, remove two beads from the "Parental" container. What does this simulate?

5. Record the genotype and phenotype of the resulting offspring in your data table. Then, put the alleles into the "Offspring" container. Replace the beads that you removed from the "Parental" container with new beads of the same color.

6. Repeat steps 4 and 5 forty-nine times. Record the genotype and phenotype of each offspring in your data table.

7. Calculate the frequencies of alleles in the offspring. First, make a table in your lab report like Table B. Then, count and record the number of black beads in the "Offspring" container. This number divided by the total number of beads (100) and multiplied by 100% is the frequency of B alleles. Then, count and record the number of white beads in the "Offspring" container. Determine the frequency of b alleles as you did with the B alleles.

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