8th Grade Science Test Review

25 Questions  I  By Monicada
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 8th Grade Science Test Review
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  • 1. 
    An organelle enclosed in a membrane that contains DNA.
    • A. 

      Cytoplasm

    • B. 

      Cell wall

    • C. 

      Chromosome

    • D. 

      Nucleus


  • 2. 
    The genetic material that determines inherited characteristics.
    • A. 

      Allele

    • B. 

      Gene

    • C. 

      DNA

    • D. 

      Chromosome


  • 3. 
    The instructions for an inherited trait.
    • A. 

      Gene

    • B. 

      Trait

    • C. 

      DNA

    • D. 

      Allele


  • 4. 
    The different forms of a gene.
    • A. 

      Gene

    • B. 

      DNA

    • C. 

      Trait

    • D. 

      Allele


  • 5. 
    Identify the  following: Dd
    • A. 

      Heterozygous

    • B. 

      Homozygous

    • C. 

      Phenotype

    • D. 

      Gene


  • 6. 
    Identify the following: rr
    • A. 

      Homozygous dominant

    • B. 

      Heterozygous recessive

    • C. 

      Homozygous recessive

    • D. 

      Heterozygous dominant


  • 7. 
    An organism’s appearance is known as its

  • 8. 
    The combination of inherited alleles together form an organism’s .

  • 9. 
    DNA is made of subunits called

  • 10. 
    The passing of traits from parents to offspring.
    • A. 

      Genes

    • B. 

      DNA

    • C. 

      Heredity

    • D. 

      Purebred


  • 11. 
    A trait or allele expressed only when two recessive alleles for the same characteristic are inherited.

  • 12. 
    Used to organize all the possible genotype combinations of offspring from particular parents.
    • A. 

      Karyotype

    • B. 

      Family tree

    • C. 

      Punnett Square


  • 13. 
    Different forms of a characteristic.

  • 14. 
    A feature that has different forms in a population.

  • 15. 

    This is an image of a _________________.
    • A. 

      Genetic map

    • B. 

      Karyotype

    • C. 

      Pedigree

    • D. 

      Genotype


  • 16. 
    A genetic disorder caused from an added chromosome to chromosome 21.
    • A. 

      Down Syndrome

    • B. 

      Cri-Du-Chat syndrome

    • C. 

      Chromosome 21 Disorder


  • 17. 
    A cross of two traits.
    • A. 

      Dihybrid cross

    • B. 

      Monohybrid cross

    • C. 

      Genetic cross


  • 18. 
    The outer boundary of the cell designed to regulate what comes and out of the cell.
    • A. 

      Nucleus

    • B. 

      Cytoplasm

    • C. 

      Membrane


  • 19. 
    Erwin Chargaff's base pairing rule state that ___________ has an equal proportion to ___________, and ____________ to _____________.
    • A. 

      Adenine to guanine and cytosine to thymine

    • B. 

      Adenine to thymine and cytosine to guanine

    • C. 

      Adenine to cytosine and guanine to thymine


  • 20. 
    A nucleotide is composed of
    • A. 

      A sugar, base and phosphate

    • B. 

      A sugar and base

    • C. 

      A base and phosphate

    • D. 

      A dna, base and gene


  • 21. 
    Scientist which contributed to the discovery of the DNA structure were: James Watson, Francis Crick, and Rosalind Franklin.
    • A. 

      True

    • B. 

      False


  • 22. 

    Rr x rr R= Round r= wrinkled What percentage of the offspring will be round? ___________
    • A. 

      25%

    • B. 

      75%

    • C. 

      50%

    • D. 

      100%


  • 23. 
    A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? R= Round r=wrinkled

  • 24. 

    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? ________

  • 25. 

    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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