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

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Grade 8 DNA, RNA, and Genetics
Alleles that show their effect on the organism whenever they are present are
  1. recessive.
  2. dominant.
  3. natural.
  4. evolved.
Grade 8 DNA, RNA, and Genetics
A dog's phenotype can be described by
  1. looking at the dog's parents.
  2. looking at the dog.
  3. mating the dog and examining its offspring.
  4. examining the dog's pedigree.
Grade 8 DNA, RNA, and Genetics
Which combination of alleles is considered to be purebred?
  1. Rr and RR
  2. RR and rr
  3. Rr and rr
  4. Rrr and RR
Grade 8 DNA, RNA, and Genetics
What is an important result of the process of meiosis?
  1. Chromosomes are copied twice.
  2. The nucleus divides once.
  3. Four cells are produced from a single cell.
  4. Two cells are produced from a single cell.
Grade 8 DNA, RNA, and Genetics
Marie has light brown hair. When she spends time outside in the sun, her hair becomes lighter. Based on this information, what can you assume about Marie’s hair color?
  1. Marie’s children will all have brown hair.
  2. Marie received two different brown hair alleles, one from each parent.
  3. Marie’s hair color is due to her genetic makeup and her interaction with the environment.
  4. Marie’s hair color is a result of a codominant trait and an incompletely dominant trait.
Grade 8 DNA, RNA, and Genetics
In humans, only identical twins have the same DNA.
  1. True
  2. False
Grade 8 DNA, RNA, and Genetics
Features of an organism inherited from parents are
  1. gifts.
  2. talents.
  3. traits.
  4. genes.
Grade 8 DNA, RNA, and Genetics
If you cross the genotype Pp with pp, the possible genotypes in offspring are
  1. Pp and pp.
  2. all Pp.
  3. all PP.
  4. all pp.
Grade 8 DNA, RNA, and Genetics
A double helix is a nucleotide.
  1. True
  2. False
Grade 8 DNA, RNA, and Genetics
Which represents a heterozygous genotype?
  1. AA
  2. Aa
  3. aa
Grade 8 DNA, RNA, and Genetics
Which statement correctly describes the sex chromosomes in a human male?
  1. He has only one sex chromosome.
  2. He has two X chromosomes.
  3. He has one X chromosome and one Y chromosome.
  4. He has two Y chromosomes.
Grade 8 DNA, RNA, and Genetics
Suppose each body cell of Animal A has 70 chromosomes, each sperm of Animal B has 36 chromosomes, and each egg of Animal C has 35 chromosomes. Which statement is true?
  1. Animal A has the most chromosomes overall.
  2. Animal B and C are probably the same kind of animal.
  3. Animal A and C could be the same animal.
  4. Animal C has the most chromosomes in its body cells.
Grade 8 DNA, RNA, and Genetics
Genotype is only the observable genes.
  1. True
  2. False
Grade 8 DNA, RNA, and Genetics
What are genetic switches?
  1. proteins that turn genes on and off
  2. light switches
  3. switches that make traits seen or not
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