Biology Exploring Study Set 1

Biology

Quiz 10 :

Genetic Linkage, Sex-Linkage, and Other Non-Mendelian Inheritance Mechanisms

Quiz 10 :

Genetic Linkage, Sex-Linkage, and Other Non-Mendelian Inheritance Mechanisms

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Which process is generally the cause for the production of recombinant offspring for two genes on the same chromosome?
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D

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Which phrase best defines what is meant by gene linkage?
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A

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What is caused by the human genetic condition called Leber's hereditary neuropathy?
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C

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Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. If these genes are not linked, what should be the phenotype ratio of the offspring produced by a testcross (RrTt × rrtt)?
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In humans, which condition does sex determination generally depend upon?
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If two genes on the same chromosome are located 10 map units from each other, what percentage of the offspring should have a recombinant phenotype?
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Under which condition would you expect the SRY gene to be switched on?
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Which of the following best describes sex-linked genes?
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Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. Presuming no linkage between the genes, what should be the phenotype ratio of the offspring produced by a testcross (RrTt × rrtt)?
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Suppose an individual is born with both an X and a Y chromosome, but the Y chromosome has a mutation that eliminates the function of the SRY gene. How would this person appear phenotypically?
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Which scientist was responsible for the characterization of linked genes?
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What are the two major types of chromosomes in many eukaryotic organisms?
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If two genes are located on different chromosomes, what percentage of the offspring should have a recombinant phenotype?
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Suppose that in Drosophila melanogaster, the allele for red eyes is dominant over the allele for purple eyes, and the allele for a grey body is dominant over the allele for a black body. Also suppose that a testcross was done to check for genetic linkage between the genes for these traits, with the following results for the offspring: 478 flies with red eyes and a black body 27 flies with red eyes and a grey body 462 flies with purple eyes and a grey body 33 flies with purple eyes and a black body Which of the following best represents the map distance between the genes for these two traits?
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From which studies did the discovery of sex-linked genes and the production of the first chromosome map arise?
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Who developed the concept of mapping genes on chromosomes when he was an undergraduate student?
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Suppose two genes a and b are 7.4 map units from each other, and that genes b and c are 5.7 map units from each other. You do a cross to determine the map distance between a and c. Which result would indicate that c lies between a and b?
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In Drosophila melanogaster the allele for long wings is dominant over the allele for vestigial wings, and the allele for a grey body is dominant over the allele for a black body. A testcross was done to check for genetic linkage between the genes for these traits, with the following results for the offspring: 410 flies with long wings and a black body 105 flies with long wings and a grey body 390 flies with vestigial wings and a grey body 95 flies with vestigial wings and a black body Which of the following best represents the map distance between the genes for these two traits?
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Which of the following traits determines recombination frequency between two linked genes?
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Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Also suppose that the only females you see present are red-eyed, but the males you see present are both red-eyed and white-eyed. The allele for red eye colour (Xw+) is dominant over the allele for white eye colour (Xw). Which of the following describes the genotypes of the parents?
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