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Quiz 8 2006 key

Quiz 8 2006 key - Quiz 8 Fall 2006 Bio 181 Sections 7 8H...

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Quiz 8 Fall 2006 Bio 181, Sections 7, 8H Key 1. True or false: Mendel found that most genetic traits followed the rule of 'blending inheritance,' where offspring show phenotypes intermediate between those of their parents. Correct answer: False 2. True or false: When breeding a homozygous dominant with a homozygous recessive (ie, RR x rr), Mendel's work shows that all the progeny in the F1 should carry the dominant phenotype. Correct answer: True 3. In an individual heterozygous for a particular trait, Tt, why can two types of gametes (T and t) be produced? Correct answer: Because meiosis I separates the homologous chromosomes (the ones inherited from the mother and the father) Incorrect answers: Because all cell division results in identical daughter cells Because recombination randomizes the order of genes on a chromosome Because in meiosis II, sister chromatids (which are replicated copies) separate 4. In a test cross, an individual showing the dominant phenotype is mated to an individual who is homozygous recessive for a trait. In the F1 generation, half the progeny show the dominant phenotype and half show the recessive phenotype. What conclusion can be drawn? Correct answer: The parent who showed the dominant phenotype was heterozygous for the trait Incorrect answers: The parent who showed the dominant phenotype was homozygous for the trait The data were inconclusive The trait is sex-linked 5. In labrador dogs, the coat color is determined by the “E” gene. Dogs that are “EE” or “Ee” are black, and dogs that are “ee” are yellow or red, depending on some other genes we won’t worry about for now.
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