Genetics Questions
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Questions and Answers

What is the likely genotype of the parents in a cross that yields a 3:1 ratio of a particular trait in the offspring?

  • Homozygous
  • Hemizygous
  • Polyzygous
  • Heterozygous (correct)

    • How many unique combinations of maternal and paternal chromosomes can be produced in a species with a haploid number of 23 chromosomes?

  • About 8 million (correct)
  • About 1 million
  • About 100,000
  • About 64 million

    • An individual in a diploid species can possess up to how many alleles for a particular gene?

  • Four
  • Three
  • One
  • Two (correct)

    • What is the result of meiosis I in a diploid organism?

    <p>Homologous chromosomes are separated</p> Signup and view all the answers

    What is the term for the phenomenon where the phenotype of the offspring is a combination of the parental phenotypes?

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

    What stage of cell division is characterized by 5 total chromosomes and 10 sister chromatids in a diploid organism with 10 chromosomes?

    <p>Prophase II</p> Signup and view all the answers

    In a cross between brown rabbits with deformed legs and white rabbits with deformed legs, what proportion of offspring would be expected to inherit the deformed leg trait?

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

    What is the function of homologous chromosomes in meiosis?

    <p>Carry the same genes that code for the same traits</p> Signup and view all the answers

    A man with normal color vision has a color-blind daughter. What is the genotype of the mother?

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

    An individual with a mutation on chromosome 3 has children with two X chromosomes and a chromosome 3 with the SRY gene. What is the likely gonadal sex of these children?

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

    A man with extra digits (six fingers on each hand and six toes on each foot) has a child with extra digits. What is the probability that their next child will have extra digits?

    <p>½</p> Signup and view all the answers

    What is true about the DNA in one of your brain cells compared to one of your heart cells?

    <p>The DNA is identical</p> Signup and view all the answers

    What is the primary advantage of sexual reproduction in plants?

    <p>Increased genetic diversity for adaptation</p> Signup and view all the answers

    In a cross between a female fruit fly with cinnabar eyes and a wild-type male, what is the expected phenotype of the F1 females?

    <p>Half will have cinnabar eyes and half will have wild-type eyes</p> Signup and view all the answers

    What is the purpose of the distilled water sample in the scientist's experiment?

    <p>To serve as a negative control for the experiment</p> Signup and view all the answers

    What is the genotype ratio of the F2 generation in Mendel's cross between yellow-seeded and green-seeded pea plants?

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

    What is the relationship between the codons UUU and UUC in the genetic code?

    <p>They code for the same amino acid</p> Signup and view all the answers

    What is the intermediate molecule in the central dogma?

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

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