SKIP

• Section 1 - Genetic Survey

  Find your genetic characteristic for 7 traits in Table 12-1, fill in your phenotype and dominant/recessive in Table 4 on p. 112..

  1. ear lobes

  3. tongue rolling

  5. chin cleft

  7. color vision: see Table 12-3 p. 109 for sex-linked traits.

• Section 2 - Blood Type Demonstration p. 107

  SKIP

• Section 3 - Questions p. 108 (data sheet p. 113)

  Answer questions #1 and #3, skip #2 on blood test.

Table 12-3: 12 human genetic traits p. 109.

1. Blood type exhibits codominance: I^A and I^B are codominant over I^O.
   Note: The blood type allele I^O is shown as i in the textbook.

2. Rh factor is an antigen: + has the factor and is dominant over -.

4. Sex-linked traits such as color blindness exhibit peculiar inheritance patterns.
   Note: Colorblind allele is shown as X^c, normal vision allele as X, instead of the r or R in the textbook.

8. Hair texture exhibits incomplete dominance (intermediate dominance): heterozygote (CS) is wavy.

9. Baldness dominance is sex-dependent: males are bald if BB or Bb; females must be BB to be bald.

Procedure p. 110

• Work in pairs - obtain numbered bags indicating genotypes for the 12 traits. Fill in data sheet starting p. 115.

• Find genotypes and phenotypes of the parents.

• Then, each parent randomly produces gametes (top side of disc) with the 12 alleles; mate.

• Beget 4 children, determine genotypes and phenotypes: a partially-filled combined parents/child example.

Questions (data sheet p. 118)

Skip #1 - #7 summaries of your family, and skip #12 on chi-square test.