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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 a phenotype?
  1. an organism's genetic makeup or allele combination
  2. an organism's physical appearance or visible traits
Grade 8 DNA, RNA, and Genetics
A dominant gene usually shows itself over a
  1. homozygous gene.
  2. heterozygous gene.
  3. recessive gene.
  4. sex-linked trait.
Grade 8 DNA, RNA, and Genetics
Genetics concerns itself with understanding
  1. heredity.
  2. dominance.
  3. pea plants.
Grade 8 DNA, RNA, and Genetics
If an organism has two identical alleles for a certain trait, it is
  1. heterozygous.
  2. dominant.
  3. recessive.
  4. homozygous.
Grade 8 DNA, RNA, and Genetics
What is a pedigree?
  1. a family tree
  2. a chart organizing genetic conditions passed down in a family
  3. a chart showing the family's DNA strains
  4. a flow chart
Grade 8 DNA, RNA, and Genetics
The passing of traits from parents to offspring is
  1. heredity.
  2. genetics.
  3. reproduction.
  4. chromosomes.
Grade 8 DNA, RNA, and Genetics
What is the genetic material of a cell?
  1. hormones
  2. hemoglobin
  3. DNA
  4. proteins
Grade 8 DNA, RNA, and Genetics
What describes a segment of DNA that determines a specific trait in a person, such as attached earlobes?
  1. a gene
  2. a phenotype
  3. a chromosome
  4. a characteristic
Grade 8 DNA, RNA, and Genetics
What is homozygous?
  1. having two identical alleles for a trait
  2. having two different alleles for a trait
Grade 8 DNA, RNA, and Genetics
Gregor Mendel studied genetics by crossing pea plants that had different traits. What did Mendel describe as a dominant trait?
  1. a trait that is seen in every offspring
  2. a trait that is due to environmental influence
  3. a trait that is present only when an offspring inherits two dominant “factors” (alleles)
  4. a trait that is present when an offspring inherits at least one dominant “factor” (allele)
Grade 8 DNA, RNA, and Genetics
An organism has the genotype of Bb for a certain trait. What describes the genotype of this organism?
  1. homozygous
  2. heterozygous
  3. inbred
  4. codominant
Grade 8 DNA, RNA, and Genetics
What is a genotype?
  1. an organism's genetic makeup or allele combinations
  2. an organism's physical appearance or visible traits
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