Genetics: X Chromosome Ratio and Dihybrid Cross
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Questions and Answers

What determines the sex of an individual according to the passage?

  • The presence or absence of the Y chromosome
  • The type of inheritance system, such as the ZW system
  • The ratio of X chromosomes to sets of autosomes (correct)
  • The number of chromosomes in the individual
  • In the ZW system for sex determination in birds, what is the genotype of a female bird?

  • ZZ
  • WW
  • ZW (correct)
  • XX
  • What is the phenotypic ratio of the F2 generation in a dihybrid cross?

  • 9:3:3:1 (correct)
  • 1:2:1
  • 3:1
  • 1:1
  • In the bee haploid system, what is the genotype of a fertilized egg (female)?

    <p>Diploid (32)</p> Signup and view all the answers

    According to Mendelian genetics, what is the genotypic ratio of the F2 generation when the parents are homozygous dominant and homozygous recessive?

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

    Which of the following is NOT a type of non-Mendelian genetics mentioned in the passage?

    <p>Polyploid inheritance</p> Signup and view all the answers

    Which genotype represents a heterozygous condition in Mendelian genetics?

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

    In a dihybrid cross, if the parent organisms are both heterozygous (TtYy), what proportion of the offspring are expected to be homozygous recessive for both traits?

    <p>1/16</p> Signup and view all the answers

    What is the significance of a bee's haploid system in terms of sex determination?

    <p>Female bees are diploid, while male bees are haploid.</p> Signup and view all the answers

    In the ZW system of sex determination in birds, which sex chromosome combination results in a male bird?

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

    If an organism has a genotype of 'PpQq', how many different gamete combinations can it produce?

    <p>4</p> Signup and view all the answers

    Which statement best describes homozygous individuals in Mendelian genetics?

    <p>They carry two identical alleles for a particular gene.</p> Signup and view all the answers

    In the ZW sex determination system found in birds, which of the following represents the genotype of a male bird?

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

    In a dihybrid cross involving two traits, what is the maximum number of phenotypic classes that can be observed in the F2 generation?

    <p>16</p> Signup and view all the answers

    In the haploid system of sex determination in bees, what is the genotype of a male bee?

    <p>Haploid (n)</p> Signup and view all the answers

    According to Mendel's law of segregation, what is the genotypic ratio of the F2 generation in a monohybrid cross involving a dominant and a recessive allele?

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

    In Mendelian genetics, what term is used to describe an individual who exhibits a particular phenotype, but does not have the genotype that typically produces that phenotype?

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

    In a test cross, an individual with a dominant phenotype is crossed with a homozygous recessive individual. What is the expected ratio of phenotypes in the offspring?

    <p>1:1</p> Signup and view all the answers

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