# Genetics - Genotype & Phenotype

### Probability

Coin Tosses - Flip a coin 10 times and record the number of "heads" and the number of "tails".

• Evaluate your individual data for the coin tosses in light of the class data. Is there an advantage to collecting large sets of data? Explain.
• What can you conclude about the frequency of heads and tails in the population as a whole.

Dice Rolls - Use the Random Dice Roll Generator to "roll" 20 dice. Record the number of rolls that generate 2,3,4,5,6,7,8,9,10,11,and 12.

• Evaluate your individual data for the dice rolls and coin tosses in light of the class data. Is there an advantage to collecting large sets of data? Explain.
• What can you conclude about the frequency of die rolls in the population as a whole?

### Phenotypic Expresion in Offspring - "Baby Lab"

(1) Working with a partner, determine the genotype of the baby by flipping pennies. "Mom" flips one penny to choose an allele for her egg and "Dad" flips the other to choose an allele for his sperm. (Note that the gender of the baby is a special case and is determined by dad alone. Boys are XY and girls are XX. Mom can give only an X but dad can give either an X or a Y.)

(2) Record the alleles which resulted from the coin flips, and put "sperm and egg" together. Write down baby's genotype for each trait in Table 1. Heads represents allele #1 and tails represents allele #2.

(3) Record the baby's phenotype in the form. Note: Dominant alleles are written with an uppercase letter and recessive alleles are written as lowercase letters. Dominant alleles mask the expression of recessive ones. Co-dominant alleles are written as uppercase letters with a subscript. Co-dominant alleles result in a phenotype that is blended.

(4) Repeat steps 1, 2, and 3 for all traits and then draw, color, and name your creation. Remember that you are drawing a baby's face - not a child's or an adult's. Use this photo to get basic positioning and proportions correct. Take a photo of the your drawing and upload it to the collaborative photo album.

(5) Using information from the table, match the photos with the genotypes of the various teams.

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