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Last update by Shanal on 11/06/2013
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24) New combinations of linked genes are due to which of the following?

A) Nondisjunction

B) Crossing over

C) Independent assortment

D) Mixing of sperm and egg

E) Deletions

Answer:

B) Crossing over

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    25) What does a frequency of recombination of 50% indicate?

    A) The two genes are likely to be located on different chromosomes.

    B) All of the offspring have combinations of traits that match one of the two parents.

    C) The genes are located on sex chromosomes.

    D) Abnormal meiosis has occurred.

    E) Independent assortment is hindered.

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    26) A 0.1% frequency of recombination is observed

    A) only in sex chromosomes.

    B) only on genetic maps of viral chromosomes.

    C) on unlinked chromosomes.

    D) in any two genes on different chromosomes.

    E) in genes located very close to one another on the same chromosome.

    E) in genes located very close to one another on the same chromosome.

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    27) The following is a map of four genes on a chromosome:

    Between which two genes would you expect the highest frequency of recombination?

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    B) W and E

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    D) A and E

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    28) What is the reason that linked genes are inherited together?

    A) They are located close together on the same chromosome.

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    C) Chromosomes are unbreakable.

    D) Alleles are paired together during meiosis.

    E) Genes align that way during metaphase I of meiosis.

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    29) What is the mechanism for the production of genetic recombinants?

    A) X inactivation

    B) Methylation of cytosine

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    30) In a series of mapping experiments, the recombination frequencies for four different linked genes of Drosophila were determined as shown in the figure. What is the order of these genes on a chromosome map?

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    31) Which of the following two genes are closest on a genetic map of Drosophila?

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    32) Genes D and F could be

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    33) The frequency of crossing over between any two linked genes will be which of the following?

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    34) Map units on a linkage map cannot be relied upon to calculate physical distances on a chromosome for which of the following reasons?

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    C) Physical distances between genes change during the course of the cell cycle.

    D) The gene order on the chromosomes is slightly different in every individual.

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    35) Which of the following is a map of a chromosome that includes the positions of genes relative to visible chromosomal features, such as stained bands?

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