Genetics test review

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Genetics test review

  1. 1. Genetics Test Review
  2. 2. <ul><li>The allele for brown eye color is dominant over blue. A brown-eyed woman (whose father had blue eyes) married a man with blue eyes (whose mother was brown-eyed). What genotypic and phenotypic ratios would you expect in their children? </li></ul>
  3. 3. <ul><li>Nystagmus is a condition in humans in which those affected have eyeballs that roll involuntarily. The genes for this trait are incompletely dominant. A normal man marries a woman who is slightly nystagmus. What is the chance that their children will be affected? </li></ul>
  4. 4. <ul><li>A woman with blood type B marries a man. They have 3 kids. One is type B, the other 2 are type O. What are the genotypes of everyone in the family? </li></ul>
  5. 5. <ul><li>A dominant gene is responsible for the gray body color of fruit flies: its recessive allele produces black body color. A cross of a gray female with a black male produces 52 black and 58 gray flies. What are the genotypes of the parents ? </li></ul>
  6. 6. <ul><li>In humans the size of mouth is codominant. There are 3 sizes, small, medium and large. Assign the symbols for the alleles and do the following crosses and tell the expected phenotypes . </li></ul><ul><li>small x medium </li></ul><ul><li>medium x large </li></ul><ul><li>What would the genotypes of the parents have to be so that the parents could have 3 children with different phenotypes? </li></ul>
  7. 7. <ul><li>In pea, plants tall is dominant over short. A tall plant is crossed with a short one producing offspring of which about ½ are tall and ½ are short. What are the genotypes of the parents? </li></ul>
  8. 8. <ul><li>Some miscellaneous, but related questions: </li></ul><ul><ul><li>How many chromosomes do you have per trait </li></ul></ul><ul><ul><li>What is a gene? </li></ul></ul><ul><ul><li>How many chromosomes do you have in each cell? </li></ul></ul>

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