Discover Health Occupations Readiness Test: Understanding Genetics Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. In 1900, what observation helped other scientists realize the significance of Mendel's work?

Question 2 2. The locus is _____.

Question 3 3.

You have the following alleles: B=blue, b=green, H=two-horned and h=one-horned:

Which of the following crosses most likely produced the following results?

54 blue, two-horned lizards

18 blue, one-horned lizards

18 green, two-horned lizards

6 green, one-horned lizards

Question 4 4. A scientist is studying an animal which can be found with either black or white fur. Which of following could be FALSE in this study?

Question 5 5. A Punnett square is useful when determining phenotypic output, for all of the following reasons EXCEPT:

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Question 6 6. Which of the following is NOT an example of a phenotype?

Question 7 7. Sarah has blonde hair even though both of her parents have brown hair. In old photos she has seen that both her parents' mothers had blonde hair before it went white. Given this information what can you suggest about the dominance of the different hair color genes?

Question 8 8. Two animals heterozygous at gene A are mated. What ratio of genotypes will be produced in the offspring?

Question 9 9. An allele is _____.

Question 10 10.

Which of the following statements is true?

I. The one thousandth base pair on chromosome one of an organism is an example of a locus.

II. Changing the DNA in a gene by one base pair could create a new allele.

III. Cells in a diploid organism possess two copies of each homolog (except gametes).

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Question 11 11. Which of the following is NOT an example of a homozygous genotype?

Question 12 12. Gregor Mendel proposed which of the following concepts?

Question 13 13. The organisms in the initial step in a series of genetic crosses are known as the _____.

Question 14 14. What type of organism has two copies of every gene?

Question 15 15. Consider the following experiment: A scientist determines that the number of dorsal spines of her experimental fish is determined by a single locus. She mates a fish with 1 dorsal spine with a fish of the same species with 2 dorsal spines. The mating produces ten fish, which all have 1 dorsal spine. Which of the following statements does not fit with this result?

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Question 16 16. The trait which is not expressed in a heterozygous state is known as

Question 17 17. The law of independent assortment states that:

Question 18 18. Mendel's study of what plant eventually revolutionized the understanding of heredity?

Question 19 19. In dogs, black fur is dominant and yellow fur is recessive. Which of the following is a correct Punnett square for a genetic cross between two heterozygous dogs?

Question 20 20. Which phenotypic ratio is indicative of a dihybrid cross?

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Question 21 21. Which of the following statements does NOT help explain Mendel's law of segregation?

Question 22 22. How would you define a dihybrid cross?

Question 23 23. How many phenotypes are typically produced by a dihybrid cross?

Question 24 24. Which of the following explains why bacteria DO NOT follow Mendel's First Law?

Question 25 25. Mendel's second law is also known as:

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Question 26 26. The trait which is expressed in a heterozygous state is known as

Question 27 27. A _____ is a cross between two individuals that are heterozygous at two loci.

Question 28 28.

Which of the following statements is true?

I. A dihybrid cross is a cross between individuals heterozygous at one gene.

II. The law of independent assortment describes the relationship between alleles of a single gene.

III. The law of segregation describes the manner in which genes on different chromosomes segregate.

IV. Homologous chromosomes segregate into different gametes.

Question 29 29. When an organism is diploid, that means it has _____.

Question 30 30.

You could draw which of the following conclusions from a dihybrid cross which produces a 9:3:3:1 ratio of phenotypes?

I. The alleles of one gene sort independently of another gene.

II. The alleles of the two genes in question exhibit a simple dominant/recessive relationship.

III. The animals which were crossed were both homozygous with respect to at least one locus in question.

Discover Health Occupations Readiness Test: Understanding Genetics Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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