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In a genetic laboratory, a plant species was subjected to radiation to produce chromosome mutations. The mutated plant was then inbred for many generations until it was true breeding for all of these mutations. It was then crossed to the original non-mutated plant, and the meiotic process of the F1 hybrids was examined. In the examination, a cell with a dicentric chromosome and an acentric fragment was noticed in anaphase I of the hybrid. (i) What kind of chromosomal mutation occurred in the irradiated plant? In your answer, indicate the position of the centromere. (ii) Diagram the alignment of the chromosomes during meiosis. Assume that the gene sequence in the original unirradiated plant is AB//CDEFGHIJK and the inverted region involved genes DEFGHI (double strokes indicate the position of the centromere).

In a genetic laboratory, a plant species was subjected to radiation to produce chromosome mutations. The mutated plant was then inbred for many generations until it was true breeding for all of these mutations. It was then crossed to the original non-mutated plant, and the meiotic process of the F1 hybrids was examined. In the examination, a cell with a dicentric chromosome and an acentric fragment was noticed in anaphase I of the hybrid. (i) What kind of chromosomal mutation occurred in the irradiated plant? In your answer, indicate the position of the centromere. (ii) Diagram the alignment of the chromosomes during meiosis. Assume that the gene sequence in the original unirradiated plant is AB//CDEFGHIJK and the inverted region involved genes DEFGHI (double strokes indicate the position of the centromere).

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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In a genetic laboratory, a plant species was subjected to radiation to produce chromosome mutations. The mutated plant was then inbred for many generations until it was true breeding for all of these mutations. It was then crossed to the original non-mutated plant, and the meiotic process of the F1 hybrids was examined. In the examination, a cell with a dicentric chromosome and an acentric fragment was noticed in anaphase I of the hybrid. (i) What kind of chromosomal mutation occurred in the irradiated plant? In your answer, indicate the position of the centromere. (ii) Diagram the alignment of the chromosomes during meiosis. Assume that the gene sequence in the original unirradiated plant is AB//CDEFGHIJK and the inverted region involved genes DEFGHI (double strokes indicate the position of the centromere). (ii) Diagram the results of a single crossover between homologous gene E and F in the inversion.
Transcribed Image Text:In a genetic laboratory, a plant species was subjected to radiation to produce chromosome mutations. The mutated plant was then inbred for many generations until it was true breeding for all of these mutations. It was then crossed to the original non-mutated plant, and the meiotic process of the F1 hybrids was examined. In the examination, a cell with a dicentric chromosome and an acentric fragment was noticed in anaphase I of the hybrid. (i) What kind of chromosomal mutation occurred in the irradiated plant? In your answer, indicate the position of the centromere. (ii) Diagram the alignment of the chromosomes during meiosis. Assume that the gene sequence in the original unirradiated plant is AB//CDEFGHIJK and the inverted region involved genes DEFGHI (double strokes indicate the position of the centromere). (ii) Diagram the results of a single crossover between homologous gene E and F in the inversion.
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