A. albinism B. cystic fibrosis C. galactosemia D. Tay-Sachs 1. Identify the disease characterized by the absence of melanin. Complex Inheritance and Human

A. albinism

B. cystic fibrosis

C. galactosemia

D. Tay-Sachs

1. Identify the disease characterized by the absence of melanin.

Complex Inheritance and Human HeredityChapter 11

Chapter Diagnostic Questions

2. Under what circumstances will a recessive trait be expressed?


Chapter Diagnostic Questions

A. A recessive allele is passed on by bothparents.

B. One parent passes on the recessive allele.

C. The individual is heterozygous for the trait.

D. The individual is homozygous dominant.

A. skin cells.

3. Where do gametes come from?


11.1 Formative Questions

B. the liver.

C. gonads

D. It is caused by acid excretion and results in

sterility

A. DD

B. Dd

C. dd

D. dE

4. Which is the genotype of a person who is a carrier for a recessive genetic disorder?



A. dosage compensation

B. incomplete dominance

C. multiple alleles

D. sex-linked

5. When a homozygous male animal with black fur is crossed with a homozygous female with white fur, they have offspring with gray fur. What type of inheritance does this represent?



A. at least one parent is a carrier

B. both parents are carriers

C. both parents are homozygous recessive

D. at least one parent is homozygous dominant

6. Albinism is a recessive condition. If an albino squirrel is born to parents that both have normal fur color, what can you conclude about the genotype of the parents?



A. autosomes

B. centromere

C. monosomes

D. sex chromosomes

7. Of the 23 pairs of chromosomes in human cells, one pair is the _______.



A. blood type

B. color blindness

C. hemophilia

D. skin color

8. Which is an example of a polygenic trait?



A. The blood type of an individual.

B. The locations of genes on a chromosome.

C. The cell’s chromosomes counted and

arranged in pairs.

D. The phenotype of individuals in a pedigree.

9. What does a karyotype show?



A. normal male.

B. normal female.

C. Down’s syndrome male.

D. Down’s syndrome female.

10. What does this karyotype show?



A. multiple alleles

B. nondisjunction

C. mitosis

D. correct meiosis

11. What is occurring in this diagram?



A. Down syndrome

B. Klinefelter’s syndrome

C. Tay-Sachs syndrome

D. Turner’s syndrome

12. What condition occurs when a person’s cells have an extra copy of chromosome 21?



A. 1 and 2 are siblings

B. 1 and 2 are parents

C. 1 and 2 are offspring

D. 1 and 2 are carriers

13. Use the figure to describe what the top horizontal line between numbers 1 and 2 indicates.


Chapter Assessment Questions

A. IA

B. IO

C. IB

D. i

14. Which is not an allele in the ABO blood group?


Chapter Assessment Questions

A. heterozygous

B. homozygous dominant

C. homozygous recessive

15. If a genetic disorder is caused by a dominant allele, what is the genotype of those who do not have the disorder?


Standardized Test Practice

A. RR

B. Rr

C. rr

16. Analyze this pedigree showing the inheritance of a DOMINANT genetic disorder. Which would be the genotype of the first generation father?



A. codominance

B. dosage compensation

C. epistasis

D. sex-linked

17. Shorthorn cattle have an allele for both red and white hair. When a red-haired cow is crossed with a white-haired bull, their calf has both red and white hairs scattered over its body. What type of inheritance does this represent?



A. RR

B. Rr

C. rr

18. Analyze this pedigree showing the inheritance of a recessive genetic disorder. Which would be the genotype of II-2 ?



I

II

III

1 2

1 2 3 4 5 6

1 2 3

A. Males have only one X chromosome.

B. Males have two X chromosomes.

C. Males have only one Y chromosome.

19. Why are males affected by recessive sex-linked traits more often than are females?



D. The traits are located on the Ychromosomes.

A. 25%

B. 50%

C. 75%

D. 100%

20. A carrier of hemophilia and her husband, who is unaffected by the condition, are expecting a son. What is the probability that their son will have hemophilia?



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A. albinism B. cystic fibrosis C. galactosemia D. Tay-Sachs 1. Identify the disease characterized by the absence of melanin. Complex Inheritance and Human