Genetics Quiz

Genes are carried on _____.

• A
  centromeres
• B
  chromosomes
• C
  ribosomes
• D
  nuclei

What is a gene?

• A
  An enzyme that plays a role in RNA replication.
• B
  A component of a ribosome.
• C
  An enzyme that plays a role in DNA replication.
• D
  A unit of heredity.

Susan, a mother with type B blood, has a child with type O blood. She claims that Craig, who has type AB blood, is the father. He claims that he cannot possibly be the father. If the judge heeds the rules of inheritance and assumes that a mutation did not occur, then the expected ruling is that _____.

• A
  Craig is right and doesn't have to pay child support.
• B
  Susan cannot be the real mother of the child, and she will be held under suspicion of kidnapping.
• C
  Susan is right and Craig must pay child support.
• D
  More evidence is needed to make a determination.

Which of these is the most common sex chromosome complement of a human female?

• A
  XYY
• B
  XY
• C
  X
• D
  XX

Which of these is the most common sex chromosome complement of a human male?

• A
  XY
• B
  XXY
• C
  XX
• D
  Y

Which of the following organelles contain the majority of your genetic material?

• A
  Ribosomes
• B
  Chloroplast
• C
  Nucleus
• D
  Mitochondrion

What are alleles?

• A
  Heterologous chromosomes
• B
  Alternate phenotypes (appearances)
• C
  Environmental factors that affect gene expression
• D
  Alternate forms of a gene

Genetically, why is a son more closely related to his mother than to his father?

• A
  Males get all of their chromosomes from their mother.
• B
  An X-chromosome carries more genetic information than a Y-chromosome.
• C
  A son receives two sets of chromosomes from their mother and one set of chromosomes from their father.
• D
  A Y-chromosome carries more genetic information than an X-chromosome.

All the offspring of a cross between a black-eyed fruit fly and a red-eyed fruit fly have black eyes. This means that the allele for black eyes is __________ the allele for red eyes.

• A
  more aggressive than
• B
  dominant to
• C
  recessive to
• D
  better than

Which of the following is a trisomy?

• A
  XX
• B
  XXX
• C
  XXXX
• D
  X

Given that a couple have two female children, what is the probability that their next child will be male?

• A
  50%
• B
  100%
• C
  75%
• D
  25%

Genes, such as those for red hair and freckles, that tend to be inheritied together are referred to as _____ gene.

• A
  codependent
• B
  interdependent
• C
  linked
• D
  homologous

Most human cells have 2 sets of chromosomes (2n; diploid), this means most cells carry a total of _____ chromosomes.

• A
  46
• B
  23
• C
  44
• D
  2

The AB blood type is the result of _____.

• A
  incomplete dominance
• B
  polygenic inheritance
• C
  blending inheritance
• D
  codominance

Which of the following terms refers to the situation where a single characteristic, such as height, is determined by the effects of many genes?

• A
  Codominance
• B
  Incomplete dominance
• C
  Polygenic inheritance
• D
  Pleiotropy

Which of the following applies to a situation in which males do not express a gene that is responsible for the collapse of the uterus into the vagina?

• A
  Sex-influenced inheritance
• B
  Sex-limited inheritance
• C
  X-linked inheritance
• D
  Y-linked inheritance

What name is given to cancer-causing genes?

• A
  Oncogenes
• B
  Pathogenes
• C
  Homeotic genes
• D
  Cancogenes

Color-blindness is an example of a _____.

• A
  sex-limited gene
• B
  sex-influenced gene
• C
  Y-linked gene
• D
  X-linked gene

In the determination of the expression of an individual's genes _____.

• A
  the environment never plays a role
• B
  the environment often plays a role
• C
  genes play no role
• D
  only one pair of genes play a role

In the United States, sickle-cell disease is most commonly seen in _____.

• A
  African-Americans
• B
  Native Americans
• C
  Euro-Americans
• D
  Inuits