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Question: 1. Unattached earlobes are controlled by a dominant allele, E, while attached earlobes are controlled by a recessive allele, e. If a homozygous dominant individual for unattached earlobes mates with an heterozygous dominant individual for unattached earlobes, which statement is correct about their possible offspring? A. Their offspring have a 25% chance of having attached earlobes. B. Their offspring have a 75% change of having attached earlobes. C. Their offspring have a 0% chance of having unattached earlobes. D. Their offspring have a 100% chance of having unattached earlobes. 2. A student wants to demonstrate the genetic principles of dominance, codominance, and recombination in an experiment with rose plants. Which set of parent plants should he choose for the experiment? A. red rose x white rose = pink and white striped roses red rose x purple rose = pink roses B. red rose x purple rose = red roses red rose x white rose = red and white striped roses C. red rose x white rose = red and white striped roses red rose x purple rose = pink roses D. red rose x purple rose = red roses red rose x white rose = pink and white striped roses 3.The great variety of possible gene combinations in a sexually reproducing species is due in part to the — A. pairing of genes as a result of differentiation. B. sorting of genes as a result of meiosis. C. pairing of genes as a result of mitosis. D. sorting of genes as a result of gene replication. 4.In summer squash, the gene for white-colored fruit is dominant over the gene for yellow-colored fruit. If homozygous yellow-fruited plants are crossed with heterozygous white-fruited plants, what is the expected distribution of fruit color produced in the offspring? A. 100% yellow B. 50% yellow, 50% white C. 100% white D. 25% yellow, 75% white 5.If a defective gene occurs on the X-chromosome, it will normally be transmitted to male offspring only by — A. mutation. B. segregation. C. the mother. D. the father. 6.The gene for hemophilia is sex-linked. A woman who is heterozygous for hemophilia marries a man who does not carry the gene for hemophilia. Which of the following will be true? A. All of their sons will be hemophiliac. B. All of their daughters will be carriers of hemophilia. C. Half of their daughters may be hemophiliac. D. Half of their children of either sex may receive the gene for hemophilia. 7.
Let's go through each question one by one: 1. Unattached earlobes are controlled by a dominant allele, E, while attached earlobes are controlled by a recessive allele, e. If a homozygous dominant individual for unattached earlobes (EE) mates with a heterozygous dominant individual (Ee): - The possible offspring genotypes are EE and Ee. - Since both EE and Ee result in unattached earlobes (dominant trait), their offspring have a 100% chance of having unattached earlobes. - Correct Statement: D. Their offspring have a 100% chance of having unattached earlobes. 2. To demonstrate genetic principles of dominance, codominance, and recombination: - Dominance: one trait masks another (e.g., red rose x white rose = red roses, if red is dominant). - Codominance: both traits show up (e.g., red rose x white rose = red and white striped roses). - Recombination: producing a new trait (e.g., red rose x purple rose = pink roses). Considering the correct combinations that exhibit all three principles, the correct answer is: - B. red rose x purple rose = red roses (dominance) - red rose x white rose = red and white striped roses (codominance) 3. The great variety of possible gene combinations in a sexually reproducing species is due in part to: - Meiosis is responsible for the sorting and recombination of genes. - Correct Answer: B. sorting of genes as a result of meiosis. 4. In summer squash, with the gene for white fruit being dominant over yellow fruit: - Homozygous yellow (yy) crossed with heterozygous white (Yy) will produce offspring genotypes Yy and yy. - That leads to a 50% chance of yellow and a 50% chance of white. - Correct Answer: B. 50% yellow, 50% white. 5. A defective gene on the X-chromosome is normally transmitted to male offspring by the: - Males inherit their X-chromosome from their mothers. - Correct Answer: C. the mother. 6. For a woman who is heterozygous for hemophilia (X^HX^h) and a man who does not carry the gene (X^HY): - Sons have a 50% chance of having hemophilia (X^hY). - Daughters have a 50% chance of being carriers (X^HX^h). - Correct Answer: D. Half of their children of either sex may receive the gene for hemophilia.
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