(a) What types of progeny (fertile or semi-sterile, green or yellow-green) would you predict from the backcross of the F1 to the homozygous yg mutant if the gene was not on one of the two chromosomes involved in the translocation? (b) What types of progeny (fertile or semi-sterile, green or yellow-green) would you predict from the backcross of the F1 to the homozygous mutant if the yg gene is on one of the two chromosomes involved in the translocation? (c) If the yg gene is located on one of the chromosomes involved in the translocation, a few fertile, green progeny and a few semi-sterile, yellow- green progeny are produced. How could these relatively rare progeny classes arise? What genetic distance could you determine from the frequency of these rare progeny?
Semi-sterility in corn, as seen by unfilled ears with gaps due to abortion of approximately half the ovules, is an indication that the strain is a translocation heterozygote. The chromosomes involved in the translocation can be identified by crossing the translocation heterozygote to a strain homozygous recessive for a gene on the chromosome being tested. The ratio of
(a) What types of progeny (fertile or semi-sterile, green or yellow-green) would you predict from the backcross of the F1 to the homozygous yg mutant if the gene was not on one of the two chromosomes involved in the translocation?
(b) What types of progeny (fertile or semi-sterile, green or yellow-green) would you predict from the backcross of the F1 to the homozygous mutant if the yg gene is on one of the two chromosomes involved in the translocation?
(c) If the yg gene is located on one of the chromosomes involved in the translocation, a few fertile, green progeny and a few semi-sterile, yellow- green progeny are produced. How could these relatively rare progeny classes arise? What genetic distance could you determine from the frequency of these rare progeny?
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