8th Grade Science Test Review

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  • An organelle enclosed in a membrane that contains DNA.
  • The genetic material that determines inherited characteristics.
  • The instructions for an inherited trait.
  • The different forms of a gene.
  • Identify the  following: Dd
  • Identify the following: rr
  • An organism’s appearance is known as its
  • The combination of inherited alleles together form an organism’s .
  • DNA is made of subunits called
  • The passing of traits from parents to offspring.
  • Used to organize all the possible genotype combinations of offspring from particular parents.
  • Different forms of a characteristic.
  • A feature that has different forms in a population.
  • This is an image of a _________________.
  • A genetic disorder caused from an added chromosome to chromosome 21.
  • The outer boundary of the cell designed to regulate what comes and out of the cell.
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  • Erwin Chargaff's base pairing rule state that ___________ has an equal proportion to ___________, and ____________ to _____________.
    • Adenine to guanine and cytosine to thymine

    • Adenine to thymine and cytosine to guanine

    • Adenine to cytosine and guanine to thymine

  • A nucleotide is composed of
    • A sugar, base and phosphate

  • Scientist which contributed to the discovery of the DNA structure were: James Watson, Francis Crick, and Rosalind Franklin.
  • Rr x rr R= Round r= wrinkled What percentage of the offspring will be round? ___________
  • A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? R= Round r=wrinkled
  • In rabbits, grey hair is dominant to white hair.  Also in rabbits, black eyes are dominant to red eyes. These letters represent the genotypes of the rabbits:
    GG = gray hair Gg = gray hair gg = white hair BB = black eyes Bb = black eyes bb = red eyes
     A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring. Question: How many out of 16 have grey fur and black eyes? ________
  • GG = gray hair Gg = gray hair gg = white hair BB = black eyes Bb = black eyes bb = red eyes
     A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb Question: How many out of 16 have white fur and black eyes? ________

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