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1. In man, assume that spotted skin (S) is dominant over non-spotted skin (s) and that wooly hair (W) is dominant over non-wooly hair (w). Cross a marriage between a heterozygous spotted, non-wooly man with a heterozygous wooly-haired, non-spotted woman. Give genotypic and phenotypic ratios of offspring. 2.
Identify dominant and recessive traits. Create a graph based on a class data table. Determine how traits are passed down from parents to offspring. Time Required: 95 minutes. Materials Needed: Teacher computer with internet access. Projector/Smartboard. 1 computer/laptop/iPad per student with internet access. Genes and Traits handout (attached)
This activity and reference includes pho-tographs of several inherited human traits that are due to one or more genes. Both variations (dominant and recessive) of each trait are shown, accompanied by brief descriptions, frequencies (if avail-able) and other interesting information.
Students will: observe a variety of inherited traits, compare observed traits with other students in the class, develop a data table to show their results, identify dominant and recessive traits, learn that dominant traits are not always the most common.
A dominant trait is not necessarily more common and a recessive trait is not necessarily rare in a population. A good example is the trait of polydactyly (having an extra finger or toe). This trait is caused by a single dominant gene, yet is not all that common in the population. Worksheets: .
Dominant trait produces a dominant phenotype in individuals who have one copy of the allele, which can come from just one parent. For a recessive trait to produce a recessive phenotype, the individual must have two copies, one from each parent. Punnett Squares reveal genotype probability of an offspring.
1. Divide students into pairs, and give each pair a coin and a copy of the “Dominant or Recessive?” worksheet. 2. Students will take turns flipping the coins—one to determine the mother’s traits and one to determine the father’s traits. 3. If the coin lands on heads, the student will circle the dominant trait. If the coin lands on ...
