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L25 Sex-linkage and recombination of linked genes

Mer Scott 11 Fragen 5,0 (1 Bewertung)

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  1. 1Which parents determines the sex of the offspring?
    1. AMother
    2. BFather
  2. 2A male fruit fly is white eyed, which is recessive, and an X-linked gene. What term would we use to describe its genotype?
    1. AHomozygous recessive
    2. BHeterozygous recessive
    3. CHemizygous recessive
  3. 3A male fruit fly carries an X chromosome with a white eyed allele, and is mated with a female homozygous for red eye alleles. Which statement would be true?
    1. AAll offspring will have white eyes.
    2. BAll male offspring will have white eyes.
    3. CAll daughters will be heterozygotes.
  4. 4A colour blind male mates with a homozygous non colourblind female. Which statements are true?
    1. AAll sons are colourblind.
    2. BNone of the sons will be colourblind.
    3. CAll daughters will be carriers.
    4. DThere is a 50% chance one of the children will be colourblind.
    5. EIf one of the daughters has offspring with a non-colourblind male, there is a 50% chance that their son will be colourblind.
  5. 5You perform a dihybrid cross between a heterozygote and a homozygous recessive individual. Instead of the expected 1:1:1:1 ratio, the parental types are far more common and only a small ratio of the offspring are recombinants. What can you conclude and why?
    1. AThe genes did not assort independently because they are linked on the same chromosome.
    2. BThe genes did not assort independently because there was a failure to separate during anaphase I.
    3. CThe genes being tested for actually do not segregate and are alleles.
  6. 6Theoretically meiosis should cause all [blank_start]gametes[blank_end] to have the [blank_start]parental[blank_end] type if genes being observed are [blank_start]linked[blank_end].
    1. Agametes
    2. Bparental
    3. Clinked
  7. 7Which statement best describes recombinant frequency?
    1. AThe number of times recombination occurs during meiosis.
    2. BThe proportion of recombinant gametes that are produced.
    3. CThe number of recombinant individuals in a population.
  8. 8The larger the distance between two genes the less likely a chiasmata will be formed between them.
    1. ARichtig
    2. BFalsch
  9. 9A small recombinant frequency indicates a small distance between genes.
    1. ARichtig
    2. BFalsch
  10. 10What is the maximum recombination frequency?
    1. A100%
    2. B50%
    3. C49.9%

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Beschreibung
• Identify the inheritance patterns of sex-linked genes. • Explain that linked genes show non-independent assortment. • Explain that crossing over leads to recombination of linked genes. • Discuss how recombination frequencies are used to map genes.
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English
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