Understanding Dominance and Recessiveness in Genetics
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Questions and Answers

Which phenomenon occurs when one gene controls several functions or has more than one effect?

  • Pleiotropy (correct)
  • Incomplete dominance
  • Complete dominance
  • Codominance
  • Which of the following describes a situation where phenotypes coincide with genotypes in a ratio of 1:2:1?

  • Multiple alleles
  • Incomplete dominance (correct)
  • Codominance
  • Pleiotropy
  • What kind of traits involve genes on the Y chromosome and are very rare?

  • Y-linked traits (correct)
  • Codominant traits
  • Multiple alleles traits
  • X-linked traits
  • In sex determination in humans, what is the genotype of a male individual?

    <p>XmY</p> Signup and view all the answers

    What type of dominance occurs when the heterozygous phenotype is unlike either homozygote?

    <p>Codominance</p> Signup and view all the answers

    Which phenomenon involves one gene influencing several traits but in different ways based on dominance relations?

    <p>Pleiotropy</p> Signup and view all the answers

    What is a characteristic of recessive traits?

    <p>Loss of function</p> Signup and view all the answers

    Which term describes a situation where the phenotype of the hybrid does not resemble either parent?

    <p>Incomplete dominance</p> Signup and view all the answers

    What is the genetic ratio in the F2 progeny of snapdragons with the genotype ratios 1 red (AA) - 2 pink (Aa) - 1 white (aa)?

    <p>1 red : 2 pink : 1 white</p> Signup and view all the answers

    Which dominance relationship is observed when the hybrid resembles both parents?

    <p>Codominance</p> Signup and view all the answers

    What poses a challenge to Mendelian analysis when certain traits do not follow Mendel's rules?

    <p>Presence of more than two alleles</p> Signup and view all the answers

    In the context of genetic laws, what defines the dominance relationship between two alleles?

    <p>Phenotype of the heterozygote</p> Signup and view all the answers

    What is a key aspect of pedigrees with dominant traits?

    <p>Affected children always have at least one affected parent</p> Signup and view all the answers

    Which pattern of inheritance indicates a rare recessive trait?

    <p>Horizontal pattern</p> Signup and view all the answers

    In pedigree analysis, what does a vertical pattern of inheritance indicate?

    <p>Rare dominant trait</p> Signup and view all the answers

    For autosomal dominant traits, what is the criteria for transmission?

    <p>Males and females transmit the trait with equal frequency</p> Signup and view all the answers

    What does the presence of unaffected children in a pedigree with dominant traits indicate?

    <p>Both parents are heterozygous</p> Signup and view all the answers

    Which condition is sometimes observed in autosomal dominant traits that is very rare and can be lethal?

    <p>Homozygous dominant (AA)</p> Signup and view all the answers

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