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Genotype vs. Phenotype quiz #1

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  • What is the definition of genotype?
    Genotype is the genetic combination of alleles in an individual organism, typically represented as a pair of letters.
  • How is a homozygous genotype characterized?
    A homozygous genotype has two identical alleles for the same gene, either both dominant (e.g., YY) or both recessive (e.g., yy).
  • What does the term 'heterozygous' mean in genetics?
    Heterozygous refers to having two different alleles for the same gene, such as one dominant allele and one recessive allele (e.g., Yy).
  • What is the phenotype?
    Phenotype is the physically expressed trait that results from the genotype, such as the color of a pea.
  • How does a dominant allele affect the phenotype in a heterozygous genotype?
    In a heterozygous genotype, the dominant allele will mask the effect of the recessive allele, determining the phenotype.
  • What phenotype results from a homozygous dominant genotype in pea plants?
    A homozygous dominant genotype (YY) results in a yellow color phenotype in pea plants.
  • What phenotype results from a homozygous recessive genotype in pea plants?
    A homozygous recessive genotype (yy) results in a green color phenotype in pea plants.
  • Can you visually distinguish between a homozygous dominant and a heterozygous pea plant based on phenotype alone?
    No, both homozygous dominant (YY) and heterozygous (Yy) pea plants have yellow-colored peas, making them visually indistinguishable.
  • What tool can be used to predict the possible genotypes and phenotypes of offspring?
    A Punnett square is used to predict the possible genotypes and phenotypes of offspring for a specific trait.
  • What does a Punnett square represent in terms of biological processes?
    A Punnett square represents both meiosis (gamete formation) and fertilization (gamete fusion).
  • What is the significance of the dominant allele in a heterozygous genotype?
    The dominant allele in a heterozygous genotype exerts its effect over the recessive allele, determining the phenotype.
  • What is the genetic notation for a homozygous recessive genotype?
    The genetic notation for a homozygous recessive genotype is two lowercase letters, such as yy.
  • What is the genetic notation for a heterozygous genotype?
    The genetic notation for a heterozygous genotype is one uppercase letter and one lowercase letter, such as Yy.
  • What does the term 'allele' refer to in genetics?
    An allele is a variant form of a gene that can exist in different versions, such as dominant or recessive.
  • How does the genotype influence the phenotype?
    The genotype, which is the genetic combination of alleles, determines the phenotype, which is the physical expression of those genes.
  • What defines a genotype?
    A genotype is the genetic makeup of an organism, represented by a pair of alleles, such as YY, Yy, or yy.
  • the physical manifestation of a genotype, like blue eyes for bb, is an organism's _______.
    phenotype