Challenge Questions
19. Drosophila that are true breeding for the traits straight wings (S) and red eyes (R) are crossed with flies that are true breeding for curved wings (s) and brown eyes (r). A test cross is then made between the offspring…
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Test Prep for AP® Courses
11. 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, predict and identify the two genes that are most likely…
Critical Thinking Questions
7. Which best describes the Chromosomal Theory of Inheritance? 8. In a test cross for two characteristics (dihybrid cross), can the predicted frequency of recombinant offspring be 60%? Justify your claim with relevant reasoning. 9. Choose the statement that best…
Review Questions
1. When comparing humans (or in Drosophila), are X-linked recessive traits observed more frequently in males, in similar numbers between males and females, or more frequently in females, or is the frequency different depending on the trait? Why? 2. Which recombination…
Key Terms
individual with an error in chromosome number; includes deletions and duplications of chromosome segmentsautosomeany of the non-sex chromosomescentimorgan (cM)(also, map unit) relative distance that corresponds to a recombination frequency of 0.01Chromosomal Theory of Inheritancetheory proposing that chromosomes are the vehicles…
Challenge Questions
39. The gene SLC24A5 encodes an antiporter membrane protein that exchanges sodium for calcium (R. Ginger et al., JBC, 2007). This process has a role in the synthesis of the melanosomes that cause skin pigmentation. A mutation in this gene affecting a…
Test Prep for AP® Courses
28. The trait for widow’s peak can be considered a monoallelic dominant trait in humans. If a man with a widow’s peak and a woman with a straight hairline have a child together, what is the probability that the child…
Critical Thinking Questions
20. Describe one reason why the garden pea was an excellent model system for studying inheritance. 21. Consider Mendel’s studies of the traits of garden pea plant. Provide a reasoned claim, based on his experiments, for how you would perform…
Review Questions
1. Mendel performed hybridizations by transferring pollen to the female ova from what part of the male plant? 2. Which is one of the seven characteristics that Mendel observed in pea plants? 3. Imagine you are performing a cross involving…
Key Terms
allelegene variations that arise by mutation and exist at the same relative locations on homologous chromosomesautosomesany of the non-sex chromosomesblending theory of inheritancehypothetical inheritance pattern in which parental traits are blended together in the offspring to produce an intermediate physical…