IB Multiple Choice - Non-Mendelian Genetics

Test yourself on IB Multiple Choice - Non-Mendelian Genetics

• Hemophilia is an X-linked recessive genetic condition. The most common form of hemophilia affects 1 out of every 5,000 male births worldwide, but the condition is much rarer in females.
  
  Explain why this is the case.

• The figure represents a Drosophila linkage map for genes A-E. The numbers between the gene loci are the relative map units between each gene. Based on the linkage map, which two genes are most likely to segregate together?

• A test cross was made between true-breeding EEWW flies and eeww flies. The resulting 𝐹1 generation was then crossed with eeww flies. 100 offspring in the 𝐹2 generation were examined, and it was discovered that the E and W genes were not linked.
  
  Which is the correct genotype of the 𝐹2 offspring if the genes were linked and if the genes were not linked?

• Cats can be black, yellow, or calico (black and yellow patches). Coat color is carried on the X chromosome.
  
  What type of inheritance is color coat in cats?

  1. Complete dominance
  2. Codominance
  3. Incomplete dominance
  4. Sex-linked

• What are the phenotypes of the offspring and in what proportions?