CH 5: Monohybrid Crosses
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Questions and Answers

What is the defining characteristic of co-dominance?

  • Both alleles in the pair are fully expressed (correct)
  • Only one allele is fully expressed
  • Both alleles blend together to form a new trait
  • Both alleles remain hidden in the phenotype

    • Which blood type demonstrates co-dominance in humans?

  • AB (correct)
  • B
  • O
  • A

    • What is the typical format for representing a genetics cross?

  • Using chemical formulas
  • Using letters to denote alleles (correct)
  • Using numbers to signify traits
  • Using colors to represent alleles

    • In which type of cross does the focus lie on a single trait?

    <p>Monohybrid cross</p> Signup and view all the answers

    Why is it important to understand genetic principles like co-dominance?

    <p>To predict the likelihood of different traits appearing in offspring</p> Signup and view all the answers

    Which principle states that an organism possesses two alleles for any particular trait and these alleles segregate during gamete formation?

    <p>Principle of Segregation</p> Signup and view all the answers

    In a monohybrid cross, how many alleles does an organism inherit for a single trait?

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

    Which type of dominance occurs when neither allele completely masks the other, resulting in an intermediate phenotype in heterozygous individuals?

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

    If a pea plant has the genotype Tt for stem height, what height will it exhibit according to Mendel's principles?

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

    How is the phenotype of plants with genotypes RR and rr different from plants with genotype Rr in incomplete dominance?

    <p>RR and rr plants show a blend of colors, while Rr shows a solid color.</p> Signup and view all the answers

    What is the principle that states an organism has two alleles for a particular trait, and these alleles segregate during gamete formation?

    <p>Mendel's Principle of Segregation</p> Signup and view all the answers

    In monohybrid crosses, heterozygous individuals exhibit only the dominant trait in which type of dominance?

    <p>Complete Dominance</p> Signup and view all the answers

    Which type of dominance results in a blend or intermediate phenotype in heterozygous individuals?

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

    What is the term for the observable characteristics resulting from alleles affecting a specific trait?

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

    Which principle explains how traits are passed from parents to offspring and ensures genetic diversity?

    <p>Principle of Segregation</p> Signup and view all the answers

    If a plant with genotype TT is crossed with a plant with genotype tt, what will be the phenotype of the offspring?

    <p>Tall stems only</p> Signup and view all the answers

    What happens to alleles during gamete formation according to Mendel's Principle of Segregation?

    <p>They segregate and travel independently in gametes</p> Signup and view all the answers

    During a monohybrid cross, if both parents are heterozygous (Aa), what is the chance their offspring will be homozygous dominant (AA)?

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

    What is the defining feature of co-dominance?

    <p>Both alleles are fully expressed without blending</p> Signup and view all the answers

    How are alleles denoted in genetics crosses?

    <p>Uppercase for recessive and lowercase for dominant</p> Signup and view all the answers

    In a co-dominant scenario, if a parent has AB blood type, what are the possible alleles they possess?

    <p>IA and IB</p> Signup and view all the answers

    What is the focus of monohybrid crosses?

    <p>Single trait</p> Signup and view all the answers

    What types of traits exhibit predictable patterns like the classic 3:1 ratio observed by Mendel in pea plants?

    <p>Complete dominance traits</p> Signup and view all the answers

    What is the primary reason for setting up Punnett squares in genetics problems?

    <p>To map out potential offspring genotypes</p> Signup and view all the answers

    In genetics, what is the term for the physical expression of a genetic trait?

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

    Complete dominance results in which type of phenotypic ratio in offspring?

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

    What is the phenotypic ratio in offspring resulting from incomplete dominance?

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

    In complete dominance, what is the phenotype of plants with genotype Tt?

    <p>Tall stems</p> Signup and view all the answers

    What term is used to describe the event where alleles separate during gamete formation?

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

    Which type of dominance occurs when neither allele completely masks the other?

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

    When does the segregation of alleles occur according to Mendel's Principle of Segregation?

    <p>During meiosis</p> Signup and view all the answers

    What is the ratio of alleles inherited for a single trait by an organism according to Mendel's principles?

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

    Which type of cross focuses on tracking the inheritance of different versions of one gene from parents to offspring?

    <p>Monohybrid cross</p> Signup and view all the answers

    What is the key difference between co-dominance and incomplete dominance?

    <p>In co-dominance, both alleles are fully expressed simultaneously, while in incomplete dominance, neither allele completely masks the other.</p> Signup and view all the answers

    Which genetic concept plays a significant role in predicting the likelihood of different traits appearing in offspring?

    <p>Allelic expression</p> Signup and view all the answers

    What type of ratio is commonly observed in monohybrid crosses involving traits with complete dominance?

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

    What is the significance of setting up Punnett squares in genetics problems?

    <p>To predict the exact phenotypic ratios of potential offspring</p> Signup and view all the answers

    In a co-dominant scenario with a parent having AB blood type, which statement accurately describes the possible alleles they possess?

    <p>Both A and B alleles</p> Signup and view all the answers

    What principle ensures genetic diversity by stating that an organism has two alleles for a particular trait?

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

    In incomplete dominance, what would be the phenotype of offspring resulting from crossing a red-flowered plant (RR) with a white-flowered plant (WW)?

    <p>Pink flowers</p> Signup and view all the answers

    What is the main difference between monohybrid and dihybrid crosses?

    <p>Monohybrid crosses study the inheritance of one trait only, while dihybrid crosses study the inheritance of two different traits.</p> Signup and view all the answers

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