n pea plants, tall (T) is dominant to dwarf (t) and yellow (Y) is dominant to green (y). In a cross of true-breeding tall yellow peas x dwarf green peas, what proportion of the progeny are tall with yellow peas?
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100% |
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50% |
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25% |
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75% |
Two genes are located at opposite ends of a chromosome that is 200 map units long. How are they expected to recombine?
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With a frequency of approximately 200%. |
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With a frequency of approximately 50%. |
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With a frequency of approximately 100%. |
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With unknown frequency because of double crossing-over. |
Below is a pedigree of a family in which all the people in generation II are dead (indicated with a slash) because of political unrest in their country. Which children in generation III could be traced to the grandmother in this pedigree by using only mitochondrial DNA sequences?
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B, C, and E. |
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A, B, and C. |
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A and D. |
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A, B, C, D, and E. |
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