A chromosome consists of

  A. 60% DNA and 40% protein. 

  B. 60% protein and 40% DNA. 

You Answered

  C. 20% protein and 80% DNA. 

  D. 80% protein and 20% DNA. 

  E. 50% DNA and 50% protein. 

 

 

Hemophilia is

  A. incompletely dominant. 

  B. codominant. 

  C. dominant. 

  D. Y-linked. 

Correct!

  E. sex-linked. 

 

 

Normal male human sex chromosomes:

  A. XX. 

Correct!

  B. XY. 

  C. XXX. 

  D. YY. 

  E. AA. 

 

 

Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele associated with normal hearing is D. Dr. Smith's parents could have which of the following genotypes?

  A. DD and dd 

  B. dd and dd 

Correct!

  C. Dd and Dd 

  D. DD and DD 

  E. Dd and DD 

 

A normal human liver cell consists of ____ chromosomes.

  A. 2 

  B. 23 

  C. 39 

Correct!

  D. 46 

  E. 78 

 

 

Amniocentesis and chorionic villus sampling allow for testing of the ________ for abnormalities.

  A. mother 

  B. father 

  C. parents 

Correct!

  D. fetus 

  E. parents and baby 

 

 

In cell division, identical structures are

  A. heterologous chromosomes. 

  B. sister chromosomes. 

  C. daughter chromosomes. 

  D. homologous chromosomes. 

Correct!

  E. sister chromatids. 

 

 

During which stage of meiosis does synapsis and the formation of tetrads occur?

  A. interphase I 

Correct!

  B. prophase I 

  C. interphase II 

  D. prophase II 

  E. metaphase I 

 

 

A color-blind woman marries a man who is not color-blind. All of their sons, but none of their daughters, are color-blind. Which of the following statements correctly explains these results?

 A. The gene for color vision is incompletely dominant to the gene for sex determination.

 B. The gene for color vision is completely dominant to the gene for sex determination.

 C. The gene for color vision is codominant with the gene for sex determination.

Correct!

  D. The gene for color vision is linked to the X chromosome. 

  E. The gene for color vision is linked to the Y chromosome. 

 

 

Hypercholesterolemia is

 

  A. incompletely dominant. 

  B. codominant. 

You Answered

  C. dominant. 

  D. recessive. 

  E. sex-linked. 

 

 

Which of the following terms refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes?

You Answered

  A. incomplete dominance 

  B. codominance 

  C. pleiotropy 

  D. polygenic inheritance 

  E. blending inheritance 

 

 

Both mitosis and meiosis are preceded by

  A. prometaphase. 

B. interphase. 

  C. prophase. 

  D. telophase. 

  E. anaphase. 

 

 

Down syndrome has the genetic complement of

  A. XXX. 

  B. XXY. 

Correct!

  C. trisomy 21. 

  D. X0. 

  E. XYY 

 

 

Which of the following is essentially the opposite of polygenic inheritance?

  A. incomplete dominance 

  B. codominance 

  C. multiple alleles 

Correct!

  D. pleiotropy 

  E. blending inheritance 

 

How many sex chromosomes are in a human gamete?

Correct!

  A. one 

  B. two 

  C. three 

  D. four 

  E. five 

 

 

Prior to mitosis but after interphase, each chromosome of a eukaryotic cell consists of a pair of identical structures called

  A. chromatin. 

  B. daughter chromosomes. 

  C. DNA transcripts. 

  D. nucleoli. 

Correct!

  E. sister chromatids. 

 

 

Which is the first phase of mitosis?

  A. interphase 

Correct!

  B. prophase 

  C. metaphase 

  D. anaphase 

  E. telophase 

 

 

Which of the following is a feature of animal cell division that distinguishes it from plant cell division?

  A. formation of a cell plate 

  B. lack of cytokinesis 

Correct!

  C. formation of a cleavage furrow 

  D. production of four (rather than two) new cells per mitotic division 

  E. disappearance and subsequent reappearance of the nucleolus 

 

 

A person with AB blood illustrates the principle of

  A. incomplete dominance. 

Correct!

  B. codominance. 

  C. pleiotropy. 

  D. polygenic inheritance. 

  E. blending inheritance. 

 

Eukaryotic chromosomes differ from prokaryotic chromosomes in that eukaryotic chromosomes

  A. are simpler. 

  B. are circular in structure. 

  C. include fewer proteins. 

  D. are copied immediately after cell division. 

Correct!

  E. are housed in a nucleus. 

 

 

The genetic makeup of an organism constitutes its ____.

  A. phenotype 

  B. alleles 

  C. physical traits 

Correct!

  D. genotype 

  E. dominance 

 

 

Any gene located on a sex chromosome

  A. is called a recessive gene. 

Correct!

  B. is called a sex-linked gene. 

  C. is called a dominant allele. 

  D. will exhibit pleiotropy. 

  E. will exhibit codominance. 

 

 

The phase of mitosis during which the nuclear envelope fragments and the nucleoli disappear is called

  A. interphase. 

 

  B. prophase. 

  C. metaphase. 

  D. anaphase. 

You Answered

  E. telophase. 

 

 

Red-green colorblindness is

  A. incompletely dominant. 

  B. codominant. 

  C. dominant. 

  D. Y-linked. 

Correct!

  E. sex-linked. 

 

 

A testcross is a mating between an individual of unknown genotype and an individual

Correct!

  A. homozygous recessive for the trait of interest. 

  B. heterozygous for the trait of interest. 

  C. homozygous dominant for the trait of interest. 

  D. codominant for the trait of interest. 

  E. of an unknown genotype. 

 

 

Which of the following is an example of a codominant trait in humans?

  A. Huntington s Disease 

  B. hypercholesterolemia 

  C. hemophilia 

Correct!

  D. ABO blood groups 

  E. phenylketonuria 

 

 

Sexual reproduction requires ________ individual(s).

  A. 0 

  B. 1 

Correct!

  C. 2 

  D. 3 

  E. 4 

 

 

If an individual is XYY, then

  A. she is a metafemale. 

  B. he is a metamale. 

  C. she has an extra Y. 

Correct!

  D. he has an extra Y. 

  E. he has extra X syndrome. 

 

 

Which of the following is an example of incomplete dominance in humans?

  A. sickle-cell disease 

 

  B. hypercholesterolemia 

  C. Tay-Sachs 

  D. ABO blood groups 

You Answered

  E. phenylketonuria 

 

 

During which phase of mitosis do the chromosomes line up on a plane equidistant from the two spindle poles?

  A. interphase 

  B. prophase 

Correct!

  C. metaphase 

  D. anaphase 

  E. telophase 

Quiz Score: 14.25 out of 17.1

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