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\brown eyes\ is an example of a.... * ○ genotype ○ heterozygous ○ homoz…

Question

\brown eyes\ is an example of a.... *
○ genotype
○ heterozygous
○ homozygous
○ phenotype
\tt\ is a ______________ genotype *
○ genotype
○ heterozygous
○ homozygous
○ phenotype
\tt\ is a ______________ genotype *
○ genotype
○ heterozygous
○ homozygous
○ phenotype

Explanation:

Response
First Question: "Brown eyes" is an example of a....
Brief Explanations
  • Genotype: Refers to the genetic makeup (e.g., "TT", "Tt", "tt"), not the observable trait. Eliminate.
  • Heterozygous: Describes a genotype with two different alleles (e.g., "Tt"), not a trait. Eliminate.
  • Homozygous: Describes a genotype with two identical alleles (e.g., "TT" or "tt"), not a trait. Eliminate.
  • Phenotype: Refers to the observable physical or biochemical characteristic of an organism. "Brown eyes" is an observable trait, so it is a phenotype.
Brief Explanations
  • Genotype: This is a general term for genetic makeup, but the question asks for the type of genotype. Eliminate (as it’s not specific).
  • Heterozygous: A genotype with two different alleles (one dominant, one recessive, like "Tt"). "Tt" has "T" and "t", so it is heterozygous.
  • Homozygous: Requires two identical alleles (e.g., "TT" or "tt"). "Tt" has different alleles, so eliminate.
  • Phenotype: Refers to observable traits, not genetic notation. Eliminate.
Brief Explanations
  • Genotype: General term, not specific. Eliminate (question asks for type).
  • Heterozygous: Requires different alleles. "tt" has two identical alleles, so eliminate.
  • Homozygous: A genotype with two identical alleles (both recessive here, "tt"). This fits.
  • Phenotype: Refers to traits, not genetic notation. Eliminate.

Answer:

D. Phenotype

Second Question: "Tt" is a __________ genotype