ransmission Genetics worksheet 1. In Mendel's basic experiment, he began with true-breeding parental (P) plants. What did he see when he cross-fertilized P plants that had different traits? A) The F1 plants had new traits that were a blend of P traits. B) All F1 plants had the trait of one of the parental plants C) The F1 plants had an entirely new trait, not seen in either P plant. D) The F1 plants showed a combination of the two P traits in a 1:1 ratio. E) The F1 plants showed a combination of the two P traits, in a 3:1 ratio. 2. Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes? A) 2:1 B) 9:3:3:1 E) 3:1 3. In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples? D) dd D) aa x ao C) human height A) dimples B) DD C) Dd E) DI 4.Which of these crosses will only produce heterozygous offspring? A) AA x aa B) AA x Aa C) Aa x Aa E) Aa x aa 5. Which of the following human traits is an example of codominance? A) sickle-cell anemia D) AB blood type B) variation in eye color 6. Which of the following is true regarding an individual who has inherited one sickle-cell gene and one normal gene for hemoglobin? A) will develop sickle-cell anemia B) will produce only abnormal hemoglobirn C) is more likely to resist malaria than an individual with two normal genes for hemoglobin D) will most likely die before the age of 10 from complications associated with abnormal white blood cells E) has the homozygous recessive genotype for this trait 7. A couple is planning to have a child. The woman is a carrier for hemophilia and the man does not have hemophilia. What is the chance that a female child will never develop hemophilia? B) 25% C) 33% D) 50% E)100%