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Eighth Grade (Grade 8) DNA, RNA, and Genetics Questions

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Grade 8 DNA, RNA, and Genetics
What is the purpose of a Punnett square?
  1. to diagram family relationships that include several generations
  2. to explain why some genes are recessive and others are dominant
  3. to compare inherited traits to acquired traits
  4. to illustrate how the alleles of parents might be passed on to their offspring
Grade 8 DNA, RNA, and Genetics
The composition of an organism on the genetic level is its
  1. genotype.
  2. phenotype.
  3. adaptation.
  4. evolution.
Grade 8 DNA, RNA, and Genetics
Who is known as "The Father of Genetics"?
  1. Reginald Punnett
  2. Charles Darwin
  3. Alfred Wegener
  4. Gregor Mendel
Grade 8 DNA, RNA, and Genetics
On a Punnett square, what do the letters at the top and left sides represent?
  1. The letters at the top represent alleles of the parents. The letters on the left represent alleles of the offspring.
  2. The letters at the top represent alleles of the male offspring. The letters on the left represent alleles of the female offspring.
  3. The letters at the top represent alleles of one parent. The letters on the left represent alleles of the other parent.
  4. The letters at the top represent alleles of the female offspring. The letters on the left represent alleles of the female parent.
Grade 8 DNA, RNA, and Genetics
What model can be used to predict the outcome of a genetic cross?
  1. Punnett square
  2. Mendel square
  3. concept map
  4. allele triangle
Grade 8 DNA, RNA, and Genetics
Which definition describes a mutation?
  1. a change in the nucleotide base sequence of a DNA molecule
  2. a molecule that is present in all living cells and plays a role in protein production
  3. a subunit of a nucleic acid chain that consists of a sugar, a phosphate, and a base
  4. a molecule that is present in all living things and stores the information that determines inherited traits
Grade 8 DNA, RNA, and Genetics
Which situation is an example of genetic variation?
  1. Two children have different eye colors.
  2. One person is older than another.
  3. One person has a scar, but her friend does not.
Grade 8 DNA, RNA, and Genetics
A Punnett square is used to show
  1. all the possible combinations of hair colors.
  2. all possible shoe sizes.
  3. DNA type.
  4. all the possible combinations of alleles that can result from a genetic cross.
Grade 8 DNA, RNA, and Genetics
What refers to the location where genes are typically found?
  1. chromosomes
  2. proteins
  3. alleles
  4. sex cells
Grade 8 DNA, RNA, and Genetics
What is RNA?
  1. a molecule that plays a role in the synthesis of proteins
  2. a change in the base sequence of a DNA molecule
  3. a molecule that consists of amino acids linked together
  4. a building block of DNA made up of a sugar, a phosphate, and a base
Grade 8 DNA, RNA, and Genetics
A genotype with the alleles AA or Aa is
  1. dominant.
  2. recessive.
  3. Punnett.
  4. evolved.
Grade 8 DNA, RNA, and Genetics
What are chromosomes?
  1. coils of DNA and protein molecules
  2. process in which DNA is copied
Grade 8 DNA, RNA, and Genetics
Which term best describes the structure of DNA?
  1. tetrahedron
  2. double helix
  3. single strand
  4. triple octagon
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