Chromosome Practice Questions

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T/F 1. If someone is born with a birth defect, 80% of the time you can determine the cause?

T/F 2. There are more different kinds of single gene disorders than there are chromosomal aberrations.

3. What is the difference between first, second and third degree relatives. Which share the most chromosomes?

4. What are teratogenic agents? When are they most likely to effect the fetus? Give some examples.

5. What percentage of Down's syndrome if attributed to the translocated carrier state? Does the translocated Carrier State occur more frequently in males or females? What conditions besides Down's can be caused by this syndrome?

6. Which is not an assumption pertinent to mechanisms of polygenetic inheritance.

a. Many genes control the same characteristic.
b. Environment influences expression
c. Filial regression is common
d. Active gene (dominant) over inactive gene (recessive)
EXPLAIN EACH OF THE ABOVE

7. In what disease does aneuploidy occur due to nondisjunction?

8. What disease is associated with a high risk of Alzheimer's Disease?

9. What do you call twins formed by one egg and one sperm.

10. Define regression toward the mean.

11. In order for all variations in IQ among a population to be genetic, What would have to happen?

12. Define mosaicism. Does mosaicism always lead to abnormalities in the phenotype?

13. What is the most vulnerable period for the developing fetus/embryo?

Why? Explain. 14. When during pregnancy does the adverse effects of alcohol occur?

15. What is the difference between a pseudohermaphrodite and a true hermaphrodite? What causes these abnormalities?

16. When analyzing monozygotic and dizygotic twins, what is meant by concordance?

17. If concordance is high in monozygotic twins and low in dizygotic twins, do you think the problem is more likely to be genetic or environmental?

18. What is the Harty-Weinberg Principle (not the formula, the meaning)? What are the restrictions? Give some examples from the article "The Genetics of the Dunkers."

19. Make up five questions from the information that you read in the article "Double Mystery."