Mendel's Laws of Inheritance
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Questions and Answers

What is monohybrid inheritance?

  • Multiple phenotypic characteristics controlled by multiple genes.
  • One phenotypic characteristic controlled by multiple genes.
  • Multiple phenotypic characteristics controlled by one gene.
  • One phenotypic characteristic controlled by a single gene. (correct)

    • What is Mendel's first law of inheritance?

  • Law of recessive genes
  • Law of independent assortment
  • Law of segregation (correct)
  • Law of dominant genes

    • What is the purpose of a Punnett square?

  • To predict the genotype of parents
  • To determine the genotype of offspring
  • To predict the phenotype of offspring
  • To illustrate the possible genotypes and phenotypes of offspring (correct)

    • In a monohybrid cross, what is the ratio of dominant to recessive phenotypes?

    <p>3:1</p> Signup and view all the answers

    What is the genotype of a heterozygous individual?

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

    What is the probability of a child having PKU if both parents are heterozygous?

    <p>25%</p> Signup and view all the answers

    What is Mendel's second law of inheritance?

    <p>Law of independent assortment</p> Signup and view all the answers

    What is the purpose of drawing a Punnett square in a genetic cross?

    <p>To predict the possible genotypes and phenotypes of offspring</p> Signup and view all the answers

    What is the probability that an offspring will have PKU if both parents are heterozygous?

    <p>25%</p> Signup and view all the answers

    What is the purpose of a test cross?

    <p>To determine if an individual is homozygous or heterozygous for a dominant trait</p> Signup and view all the answers

    How is a test cross carried out?

    <p>By breeding an individual with an unknown genotype with a homozygous recessive individual</p> Signup and view all the answers

    What is dihybrid inheritance?

    <p>The determination of a trait by the inheritance of two genes</p> Signup and view all the answers

    What does Mendelian inheritance assume?

    <p>That the genes involved are not linked</p> Signup and view all the answers

    What is meant by sex-linkage?

    <p>An allele is located on one of the sex chromosomes and its expression depends on the sex of the individual</p> Signup and view all the answers

    What is an example of a phenotype that shows sex-linkage?

    <p>Color blindness</p> Signup and view all the answers

    How many genes are involved in dihybrid inheritance?

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

    What is the definition of a gene?

    <p>A length of DNA on a chromosome that codes for the production of one or more polypeptide chains and functional RNA</p> Signup and view all the answers

    What is the term for the genetic constitution of an organism?

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

    What is the expression of an organism's genetic constitution, combined with its interaction with the environment?

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

    What is the fixed position on a DNA molecule occupied by a gene?

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

    What is the term for different forms of a particular gene, found at the same locus on a chromosome?

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

    What is the term for having two identical alleles of a gene?

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

    What is the term for having two different alleles of a gene?

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

    What is the term for an allele that will always be expressed if an individual has one copy of it?

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

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