ap lectureguide15

AP Biology: CHAPTER 15

THE CHROMOSOMAL BASIS OF INHERITANCE

1. Describe some of the pieces of information that scientists discovered that contributed to the

“Chromosome Theory of Inheritance”?

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2. Summarize the Chromosomal Theory of Inheritance.

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3. Why was Thomas Hunt Morgan’s choice of the fruit fly a good model organism?

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4. Describe Morgan’s first mutant. Why was it so significant from the wild type?

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5. Show the cross P, F1, F2 for the white-eyed male mutant.

6. What happens when we trace the inheritance of traits found on the same chromosome?

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7. Use the diagram to trace the body color and wing shape in this linked two trait cross.

 

8. What is recombination and when does it occur? ___________________________________

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9. How is recombination frequency calculated? _____________________________________

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10. What determines sex in humans? ______________________________________________

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11. In what ways are sex-linked traits distinct from autosomal traits? _____________________

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12. Why are sex-linked recessive traits more common in human males than females?

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13. How many X chromosomes are typically expressed in humans and cats?

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14. What happens to X chromosomes that are inactivated? _____________________________

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15. How many Barr bodies would be found in a person with: XXY_____ XO_____ XXX_____.

16. Define each term & and indicate when each occurs.

a. aneuploidy _____________________________________________________________

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b. polyploidy ______________________________________________________________

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17. Identify the each of the alterations of chromosome structure.

18. List and describe a few specific examples of non-disjunctions that occur in humans.

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19. Describe genomic imprinting and give an example.

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