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Seventh Grade (Grade 7) DNA, RNA, and Genetics Questions

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Grade 7 DNA, RNA, and Genetics
An abnormal condition that a person inherits through genes or chromosomes is a
  1. pedigree.
  2. gene therapy.
  3. genetic disorder.
  4. karyotype.
Grade 7 DNA, RNA, and Genetics
What would the complementary DNA strand be for the DNA sequence AGT-CGA-CCG-AAT?
  1. ATC-GCT-TTA-GCG
  2. TCA-GCT-GGC-TTA
  3. GGG-CGC-TTA-TAG
  4. TAG-TAC-GAG-TTC
Grade 7 DNA, RNA, and Genetics
Punnett squares show the possible                       of offspring.
  1. genotypes
  2. number of chromosomes
  3. DNA sequence
  4. letters of a sequence
Grade 7 DNA, RNA, and Genetics
Which set of genotypes are homozygous dominant?
  1. AA, aa, Aa
  2. Aa, Cc, CC
  3. BB, AA, RR
Grade 7 DNA, RNA, and Genetics
The number of chromosomes in a cell produced by mitosis is
  1. half as many as the original cell.
  2. twice as many as the original cell.
  3. the same number as the original cell.
  4. random, depending on factors present.
Grade 7 DNA, RNA, and Genetics
Each rung of the DNA ladder is made of
  1. a pair of nitrogen bases.
  2. a single nitrogen base.
  3. three nitrogen bases.
  4. four nitrogen bases.
Grade 7 DNA, RNA, and Genetics
Mistakes made when DNA is being copied are
  1. selections.
  2. mutations.
  3. interactions.
  4. crossovers.
Grade 7 DNA, RNA, and Genetics
Traits are passed down.
  1. True
  2. False
Grade 7 DNA, RNA, and Genetics
The physical expression of an organism's genes is its
  1. genotype.
  2. phenotype.
  3. mutations.
  4. codominance.
Grade 7 DNA, RNA, and Genetics
When alleles for a trait are different, the organism is                .
  1. homozygous
  2. heterozygous
  3. true bred
  4. purebred
Grade 7 DNA, RNA, and Genetics
The factors that control a trait are
  1. cells.
  2. pedigrees.
  3. genes.
  4. sex cells.
Grade 7 DNA, RNA, and Genetics
If a plant has two of the same alleles for red flowers, then it can be described as
  1. homozygous.
  2. heterozygous.
  3. codominant.
  4. none of the above
Grade 7 DNA, RNA, and Genetics
DNA is organized into X-shaped structures of                  .
  1. lipids
  2. chromosomes
  3. chloroplasts
  4. none of the above
Grade 7 DNA, RNA, and Genetics
What are the nitrogen base pairs in a DNA molecule?
  1. Adenine pairs with thymine; guanine pairs with cytosine.
  2. Guanine pairs with thymine; adenine pairs with cytosine.
  3. Adenine pairs with guanine; thymine pairs with cytosine.
Grade 7 DNA, RNA, and Genetics
Which nitrogen base is NOT found in RNA?
  1. adenine
  2. cytosine
  3. guanine
  4. thymine
  5. uracil
Grade 7 DNA, RNA, and Genetics
Guanine (G) always pairs with cytosine (C).
  1. True
  2. False
Grade 7 DNA, RNA, and Genetics
What is the genotypic probability of the offspring produced from a single heterozygous cross (Hh x Hh)?
  1. 100% Hh
  2. 25% HH, 50% Hh, 25% hh
  3. 25% Hh, 50% HH, 25% hh
  4. 75% Hh, 25% hh
Grade 7 DNA, RNA, and Genetics
An organism that has two different alleles for the same trait is
  1. genotype.
  2. phenotype.
  3. homozygous.
  4. heterozygous.
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